You can get Grand Theft Auto: San Andreas for free on PC for a limited time by downloading Rockstar Games new Rockstar Games Launcher. The Rockstar Games Launcher allows you to access all of your Rockstar Games that you have purchased on the PC from one launcher. This includes Rockstar games that have been purchased from different storefronts. You will also be able to purchase different games published by Rockstar Game from the launcher so that you may add them to your collection.
In addition to being able to launch and purchase games developed and published by Rockstar Games, the Rockstar Games Launcher will include a number of other useful features such as the function to cloud save, have your Rockstar Games collection automatically updated, and receive the latest news from Rockstar Games right from the launcher. There is no word as to how long Grand Theft Auto: San Andreas will be free for when downloading the Rockstar Games Launcher other than the fact that it is only for a limited time. You can download the Rockstar Games official website here.