Where can I download the software for old RCX-era Mindstorms sets?
I've found a seemingly broken website, but from the sources I was able to salvage these addresses, they work just fine (as far as the download goes, I did not check the contents):


http://www.brickfactory.info/iso/files/9731_lego_vision_command_xp.zip -> German version
http://www.brickfactory.info/iso/files/9722_extreme_creatures_1.0.zip


Vision Command English:


https://www.mediafire.com/?xo6xfjvnbzaaf7u


Multi Software Download -> English:


https://www.mediafire.com/folder/ohsruj4zmjy9g


There are many other downloadables from this site:


http://biomediaproject.com/bmp/files/LEGO/cds/temp/1349_Lego_Studio_Dutch_XP.zip
http://www.brickfactory.info/iso/files/1382_lego_studio_sound_fx.zip
http://biomediaproject.com/bmp/files/LEGO/cds/temp/3804_dutch.zip -> RIS 2.0
http://biomediaproject.com/bmp/files/LEGO/cds/temp/3804_french.zip -> RIS 2.0
http://www.brickfactory.info/iso/files/3806-3809_Spybotics_english.zip
http://www.brickfactory.info/iso/files/8299_lego_submarine.zip
http://biomediaproject.com/bmp/files/LEGO/cds/temp/8428_Turbo_Command_CD1.zip
http://biomediaproject.com/bmp/files/LEGO/cds/temp/8428_Turbo_Command_CD2.zip
http://biomediaproject.com/bmp/files/LEGO/cds/temp/8450.zip -> cybermaster_mission
http://biomediaproject.com/bmp/files/LEGO/cds/temp/lego_cybermaster_dutch.zip
http://www.brickfactory.info/iso/files/8547_mindstorms_nxt_2.0.zip
http://www.brickfactory.info/iso/files/9731_lego_vision_command_xp_french.zip


As for the RIS ISO I've found this torrent but it looks like there is no recent activity, maybe one could ask the once-downloaders to seed for a while?
https://www.demonoid.ph/files/details/2583886/004623788640/