title: No packages or platforms in sdk manager
body: <p>In sdk manager i can't see any packages to install or any platforms.</p>
  
  <p>I have tried running the sdk as administrator and disabling the antivirus program and firewall. And i have tried uninstalling and reinstalling it several times with no success. </p>
  
  <p>I have version 18 installer_r18_windows.exe and the ADT is 18 too.</p>
  
  <p>Thanks in advance
  Regards
  Tasneem</p>