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For those who have W7 keys but not the iso's - LEGAL Ms versions
Hi there
While W10 can still be installed as an update you might want to use W7 as a base system to update from.
For those who have old Technet / Msdn / Retail W7 keys but not the iso's you can get them LEGALLY from here (note you Must have your own keys). These are the old Digital River versions and SHA1 etc is 100% the same as the original files on Technet etc.
You need to download and save as a torrent file (don't die with horror - clean legal torrents are OK) and then start up a torrent client. These aren't those dubious files from illegal sites.
Microsoft DigitalRiver Mirror
I found actually I needed to re-install W7 as a VM to check whether some programs on W10 were working correctly so it's not always bonkers keeping old OS'es around.
Cheers
jimbo