San Andreas had previously only received one official patch (patch 1.01) and it limited modding severely.
Once all that's done you can optionally apply the Fixed Vehicles pack from link 3, which is nice to have and works great alongside Silent Patch. Lastly, unzip Silent's ASI Loader this time and then drag and drop the 'vorbisHooked.dll' and 'vorbisFile.dll' files into your game's main folder. After that, unzip Silent Patch and then drag and drop the 'SilentPatchSA.asi' and 'SilentPatchSA.ini' files into your game's main folder.
To install it: simply go to link 1, expand the box below the 'Silent Patch' heading and click the 'Download' button, and then expand the box below the 'Silent’s ASI Loader ' heading and click the 'Download' button there as well. It works best with any PC version except for the 'NewSteam' version. In my opinion: it's now a necessity for any player and ultimately gives you the best San Andreas experience possible. Silent Patch is an unofficial patch that fixes all the remaining issues with this game whilst bringing back features that were only found in the console releases as well. For the respective GTA III and GTA VC discussions, please use the following 2 links:
