Download Rockstar’s new launcher and you can get a copy of GTA San Andreas for free:
https://socialclub.rockstargames.com/rockstar-games-launcher
“For a limited time”
I’m not keen on yet another launcher, as I have a dozen already… On the other hand, I underestand you need some kind of Rockstar crap even with a lot of their games off of steam, so maybe it’s unavoidable.
I’ve heard horror stories about their Social Club… I wonder if this replaces that.
I wonder if I can register my old steam GTA games on there too?
[edit] You know what, I’ve had GTA:SA on my wishlist for ages, and want to play it, but having looked at the massive amount of crap I’m going to have to go through to get it playable on modern PCs, and having looked at the massive amount of crap the installer wanted to install, I’ve just deleted the launcher installer.
I have enough other games that I can play to not have to mess with all this stuff 
I also question the logic of giving away a game that apparently doesn’t work on most modern systems as a freebie.
It’s a shame…