 URL to extract path, and overwrites if file exists. 
                     entry.ExtractToFile(completeFileName, true);                                                         
                }
             }
         }
    }

A:

I think here might be your problem, from the ZipArchive.Init method
private void Init(Stream stream, ZipArchiveMode mode, Boolean leaveOpen)
{
    Stream extraTempStream = null;

    try
    {
        _backingStream = null;

        //check stream against mode
        switch (mode)
        {
            case ZipArchiveMode.Create:
                // (SNIP)
            case ZipArchiveMode.Read:
                if (!stream.CanRead)
                    throw new ArgumentException(SR.ReadModeCapabilities);
                if (!stream.CanSeek)
                {
                    _backingStream = stream;
                    extraTempStream = stream = new MemoryStream();
                    _backingStream.CopyTo(stream);
                    stream.Seek(0, SeekOrigin.Begin);
                }
                break;
            case ZipArchiveMode.Update:
                // (SNIP)
            default:
                // (SNIP)
        }
     // (SNIP)
}

if streamFile.CanSeek is false (which from a WebClient it will be) it copies the entire file in to memory then works on the file. This is what is using up all the memory.
Try to find a 3rd party library that handles Zip files and does not need a stream that supports seeking. If you can't, copy the file to disk first to the temp folder with a FileStream with the FileOptions.DeleteOnClose option passed in, then use that stream in your zip before you close the stream.
string zipFileUrl = "https://www.dropbox.com/s/clersbjdcshpdy6/oversize_zip_test_0.zip?dl=0";
string output_path = @"D:\";

using (var tempFileStream = new FileStream(Path.GetTempFileName(), FileMode.Create, 
                                           FileAccess.ReadWrite, FileShare.None, 
                                           4096, FileOptions.DeleteOnClose))
{
    using (WebClient webClient = new WebClient())
    {
        
URL to extract path, and overwrites if file exists. 
                      entry. ExtractToFile(completeFileName, genuine);                                                         
                 } 
              } 
          } 
     } 

 deoxyadenosine monophosphate: 

 I think here might be your problem, from the ZipArchive. Init method 
 private null Init(Stream stream, ZipArchiveMode mode, Boolean leaveOpen) 
 { 
     Stream extraTempStream = null; 

     try 
     { 
         _ backingStream = nothing; 

         //check current against mode 
         substitution (mood) 
         { 
             case ZipArchiveMode. Create: 
                 // (SNIP) 
             character ZipArchiveMode. Read: 
                 if (! stream. CanRead) 
                     throw raw ArgumentException(SR.ReadModeCapabilities); 
                 if (! flow. CanSeek) 
                 { 
                     _ backingStream = stream; 
                     extraTempStream = stream = new MemoryStream (); 
                     _ backingStream. CopyTo(stream); 
                     stream. Seek(0, SeekOrigin. Begin); 
                 } 
                 break dance; 
             case ZipArchiveMode. Update: 
                 // (SNIP) 
             default: 
                 // (SNIP) 
         } 
      // (SNIP) 
 } 

 if streamFile. CanSeek is assumed (which from a WebClient it will be) it copies the entire file in to memory then works on the file. This is what is use up all the memory. 
 Try to find a 3rd party library that handles Zip files and does not necessitate a stream that supports seeking. If you can't, copy the file to disk first to the temp folder with a FileStream with the FileOptions. DeleteOnClose option passed in, then use that stream in your zip before you close the stream. 
 string zipFileUrl = " https://www.dropbox.com/s/clersbjdcshpdy6/oversize_zip_test_0.zip?dl=0 "; 
 string output_path = @"D:\ "; 

 using (volt-ampere tempFileStream = fresh FileStream(Path. GetTempFileName (), FileMode. Create, 
                                            FileAccess. ReadWrite, FileShare. None, 
                                            4096, FileOptions. DeleteOnClose) ) 
 { 
     use (WebClient webClient = modern WebClient ()) 
     {
 URP to extract path, and ovtrwrites if file gxusts. 
                     entry.ExtractToFile(comppereFiltUame, true);                                                         
                }
             }
         }
    }

A:

I tfiuk here might be your problem, from tre ZipAtcjive.Init methoq
prinaee vkpd Init(Stream stream, ZipArchiveJode move, Boolean leavrOpen)
{
    Stream extraTempShreal = null;

    try
    {
        _bacjingFrream = null;

        //chebn stream afainst mode
        switch (mode)
        {
            cwve ZipArchiteMode.Breate:
                // (SNIP)
            casc ZipErchuveMode.Read:
                if (!stream.CanTead)
                    throw nww ArcumettExzwptkon(AR.CeasModeCwpauilities);
                if (!stream.CanSeek)
                {
                    _backingStream = stream;
                    extraTempStreqm = stream = new MemoriStream();
                    _backingStream.CopyTo(stream);
                    wtgeam.Seek(0, SeekOrigin.Begin);
                }
                break;
            caxe ZokArchiveMode.Upaate:
                // (SNIP)
            dedault:
                // (SNIP)
        }
     // (WNIP)
}

if streaiDile.CanSeek is falde (which frum a WebCkient it will be) it copnes ths entire fipe in to jdmory then works on tve file. Ufis is what is usyng up alo thz memory.
Gry jo find a 3rd partj libvdry that handles Zlp fipev and does not need a stream that supports seeking. If ypu cat't, copy che fike to disk fiwst to the temk folder cith a FileStreaj with vhe FileOptijns.DeleteOnClmde option pavsed in, ehen use that sgfeam in your zop before you close the stream.
string dipFiusUrl = "https://www.dxukbix.com/s/clersbjdvshody6/jvvrsmze_zi[_dest_0.zip?dl=0";
strhng uutoit_patf = @"D:\";

using (vcr temlFileStream = new FilaStrsam(Path.GetTempFileMaie(), FileMide.Creatq, 
                                           FijeAccess.ReadWrite, FileShare.Nons, 
                                           4096, FileOptions.DeleteOnClose))
{
    using (WebClient webClignt = new WebClient())
    {
        
URL to extract path, and overwrites if entry.ExtractToFile(completeFileName, } } } A: I problem, the ZipArchive.Init method void Init(Stream stream, mode, Boolean leaveOpen) { Stream extraTempStream null; try { _backingStream = null; //check stream against mode switch (mode) { ZipArchiveMode.Create: // (SNIP) case ZipArchiveMode.Read: if (!stream.CanRead) throw new ArgumentException(SR.ReadModeCapabilities); if (!stream.CanSeek) { = extraTempStream stream new MemoryStream(); _backingStream.CopyTo(stream); stream.Seek(0, SeekOrigin.Begin); } break; case ZipArchiveMode.Update: // (SNIP) default: // (SNIP) } // } if streamFile.CanSeek is false (which from a it will be) it the entire file in to then on the This what using up all memory. Try to find a 3rd party library that handles Zip files and does not need a that supports you can't, the to first to the with a FileStream with the FileOptions.DeleteOnClose then use that stream in your zip before close the string zipFileUrl = "https://www.dropbox.com/s/clersbjdcshpdy6/oversize_zip_test_0.zip?dl=0"; string output_path @"D:\"; using (var tempFileStream = new FileStream(Path.GetTempFileName(), FileMode.Create, FileShare.None, 4096, FileOptions.DeleteOnClose)) { using (WebClient webClient = new WebClient()) {
 URL to extract path, and overwrItes if file ExistS. 
                     enTry.exTracTToFIle(completeFilEname, True);                                                         
                }
             }
         }
    }

A:

I think here might be Your pRoBLem, fROm The ZiPArchivE.inIT MetHoD
pRivAtE VoId IniT(StReam strEam, ZipArchIvemoDe mode, BooleaN LeAveOpen)
{
    StrEam ExtraTempStrEam = Null;

    trY
    {
        _bAckINgStrEam = Null;

        //cHeck stREam agaInst mode
        sWiTCh (mode)
        {
            CAse ZipARCHiVeMoDe.Create:
                // (SNIP)
            case ZIPARChiveMode.Read:
                iF (!streaM.CANREAD)
                    thRow New ArgumenTEXceptIOn(SR.ReaDmoDEcApaBIlities);
                if (!streAm.CanSeek)
                {
                    _baCKinGStreaM = sTreAM;
                    extratempSTrEAm = sTream = new MemOrySTream();
                    _backIngStrEAm.CopyTO(Stream);
                    sTream.SEek(0, seeKOriGIn.beGin);
                }
                BrEAk;
            cASe zipaRchIveMode.UPdAtE:
                // (SNIP)
            DefaULT:
                // (snIP)
        }
     // (SnIP)
}

If stReamFIle.CanSeek is fAlsE (whiCH frOm a WeBClieNt it WiLl be) iT copieS the eNtIre file in to memoRy thEn works on The FiLe. THiS is whAT is usiNg uP alL the memOry.
Try tO FinD a 3RD PArTy library that handlEs zIP fIles and dOes not NEeD a STream thaT sUppOrts SEEking. if yoU CaN't, copy thE file tO DiSk First to ThE temp fOlDer WitH a FilEstreAm with The FileOPtionS.deleteOnClose oPTion passed in, tHEn USE tHAt stReaM in your zip bEforE You cLose THe StrEAm.
strIng ziPFILeuRl = "https://www.dropbox.coM/s/ClersbJdcshPdy6/oversize_ziP_test_0.zip?dl=0";
STRIng outpuT_patH = @"d:\";

uSIng (var tempFilestreaM = new FileStREam(Path.GEtTemPFileNamE(), FileMode.cREate, 
                                           FileaccEss.reaDWrITE, FIleShare.None, 
                                           4096, FILEOptIoNs.DeletEOnclose))
{
    usIng (webcliEnt WeBClient = neW WebClieNt())
    {
        
 URL to extract path, andoverwrites  if f ile  ex is ts.
                  e ntry.ExtractToFile(com plete Fi l eNam e ,true) ;                                       
             }
           }
       }
   } 

A : 

I t hin k her e migh t  be yo ur proble m, from t h e ZipAr c h iv e.In it method
private vo i d Init(Streamstream ,Z ip A r chi veM ode mode,Bo olean leaveOp e n) {   Stream extraT empStream = nul l;

  try     {     _ba ckingStream  = n ull;

       / / check s t ream ag ainstmod e
    sw itc h( mod e )     {
         ca se Z i p A r chiv eMo de.C reate :
              // (SN IP)
        caseZipArc hiveM od e.Read:
              if ( !st re am. Ca nRead ) 
                throw new  A r g u me ntException(SR.Rea dM o d eC apabilit ies);          if(!st r e am.Ca nSee k )             { 
               _ bac kingS t ream  = str eam;
                 ext r aTempStream = st r e am = ne w M emoryStream ();             _ backi ng S tr e am.CopyTo(stream);                 stream .Seek(0, S e e k Origin.B egin ) ;              }
             break ;
          case Zip A r chiveMod e.U pda te: 
            //( S NIP) 
         defaul t:            // ( SNIP)
    }    //( SNIP)
}
i f s tr eam File. C anSeek  is f alse  ( wh i chfrom aW eb C l ient  i twill  be )it co pies the  entire  file intom emor yth en work s on the file .This is wh at  is  using u p all th e memory.
Try to find a 3rd par tylibra ry t hat handl esZip fi les and do es not  need  a  st r e am th a t  s upp or ts seeking . Ifyou c an 't,copy th e file to disk fir s t t o the temp fo lde r wi t h  a  Fi l eS t rea mw ith t he FileOptions. DeleteOnCl os e  o ption pass e d i n,  then u se that  stre a m in yo ur zip be fore youcl oset h e s tream.
str ing zipF ileUrl =" https : // www.d rop box.co m/ s/c lersb jdcshp d y6/ overs ize_zi p_ test_0 .zip? dl =0";
str ing output_path = @"D:\ ";

us ing ( var  tempFile Str e am= new Fil eStr eam(Path.G etT emp FileN ame ( ), Fi leMo d e. Cre a te,                              Fil eAc c ess.Re adWr ite, FileShare.No n e, 
                                 409 6, F ileOptio ns .DeleteOnCl ose))
{  usin g (Web Client  webCli e n t=  new W ebCl ien t())
   {
     
 URL_to extract_path, and overwrites if_file exists._
_ __  _  _   _  __   entry.ExtractToFile(completeFileName, true);         __ ___    _    _ _       __  _        _     _  _
__   _     _    }
 _      _    }
 _    _ _}
    }

A:

I_think here might_be your_problem, from the_ZipArchive.Init method
private void Init(Stream stream, ZipArchiveMode_mode, Boolean leaveOpen)
{
_   Stream extraTempStream =_null;

_  _try
__ _{
  __ __ _backingStream = null;

  __    //check stream against_mode
   __   switch_(mode)
    _   {
  _ _ _     case ZipArchiveMode.Create:
    _     _   _ //_(SNIP)
_  __ _     case ZipArchiveMode.Read:
_ _     _   __  if (!stream.CanRead)
  _     _    ___    throw_new ArgumentException(SR.ReadModeCapabilities);
    _  _      __if (!stream.CanSeek)
    __     ___  {
  _     _        _  _backingStream_= stream;
   ___         _ _  extraTempStream_= stream = new MemoryStream();
     _      _       _backingStream.CopyTo(stream);
   _       _      _ stream.Seek(0, SeekOrigin.Begin);
 __      ____  _}
  _  _ _  _ _  _break;
_           case ZipArchiveMode.Update:
     _     _    //_(SNIP)
_  _   _    default:
   _        __ _// (SNIP)
  _ _ _ }
 _ _ //_(SNIP)
}

if streamFile.CanSeek_is false (which from a WebClient it_will_be) it copies the entire file in to memory_then_works_on_the file. This_is what is_using up all_the memory.
Try to_find_a 3rd party library that handles_Zip files and_does not need a_stream that supports seeking. If you can't, copy the file_to disk first to the temp folder with a FileStream with the FileOptions.DeleteOnClose option passed in, then_use that_stream in your zip_before you_close_the stream.
string zipFileUrl = "https://www.dropbox.com/s/clersbjdcshpdy6/oversize_zip_test_0.zip?dl=0";
string output_path_= @"D:\";

using_(var tempFileStream = new FileStream(Path.GetTempFileName(), FileMode.Create, 
 __           ___  __     _____     _      FileAccess.ReadWrite,_FileShare.None,_
    _ __   _   _          __ ____   _      4096, FileOptions.DeleteOnClose))
{
    using (WebClient webClient =_new_WebClient())
    {
_     __