How to speed up the installation of GTA 5? Installing download accelerator-type software can, in principle, slightly increase the download speed of your files. Install GTA V through Rockstar Games Launcher.When launching Epic Games, search for GTA V and click on the result that appears. Install GTA V through Epic Games Launcher.Search GTA V on Steam and the game appears as the first result. You have to go through the site of the creator of this version and download the file, whether it is an APK on Android and whether the file is on iOS. As GTA 5 Mobile is not an official app, it cannot be downloaded through Google Play or the App Store.