Ok so I was curious about this and decided to grab it and see. Here is how to get the current free version DRM free:
Out of the box it uses DRM. Launching it directly will want to login to your Rockstar account. However the No CD patches will work with this version and make it DRM free as its just 1.01.
So I installed it via their launcher copied the entire GTA SA folder to a another directory then you can uninstall the game and Rockstar's Launcher.
You will need the No CD patch for version 1.01 (its not tough to find.) The game will then run fine.
And if you want to use the Hot Coffee mod, or other mods even if its not needed then its recommend to downgrade the game to 1.00.
Download link for the downgrader. It will not be able to detect your game so click 'Browse' and locate where you copied SA to.
It will then scan your game files. (it might take a while.)
Once its done you can tick anything you want under 'Essential Modifications' though I recommend ASI Loader (needed for Silent Patch) and Silent Patch. The others are up to you. (You can hover over the blue text to get a description of each one.)
Once you are happy click 'Downgrade'. You will then be asked if you want to make a copy of the game, that's upto you. But it means that if you decide you want the original you don't have to re-download it via the Rockstar Launcher (just backup the folder you copied SA to as it will patch the version you will be asked to save. Though it will take up hard drive space.)
Should you click 'Yes' you will be asked where to save the downgraded version. I just created a called GTASA and put it there, feel free to put it anywhere you want. You will then be asked to confirm again after clicking 'Confirm'.
You will then be asked if you want to create registry entries such as the original CD version had. Its up to you but you generally want to click 'Yes' as they will be needed by some mods.
Depending on the options to chose you might get a few messages about PS2 blur, that's up to you if you want it or not. Once its done you will then need to find a No CD 1.00 patch as the game will now not launch (as the No CD version was 1.01 and this will not work.) Whilst I can't link this all i'll say is GBW is where I got mine from. (You will want to replace the exe again.)
The game should now work, again and should work with any mods.
All of the above was done on Windows 10.