I used to have a Mega folder like that, until it got deleted.Why not make a dedicated and well organized drive where EVERY game is stored with exact fix state description/version number. it would be very easy to keep this up to date.
Then LiteralAutist offered to make a new one and keep it up to date, but hasn't done so in quite a while.
But if you really want it, there's nothing stopping you from doing it yourself.