If you already own the original PC version and need to update it or fix widescreen issues:
If you have an active Netflix subscription, you can download the GTA III – The Definitive Edition at no extra cost through the Netflix app or the App Store/Play Store. PC and Console Versions Download com rockstar gta3 zip
Search for Grand Theft Auto III or use the package name com.rockstar.gta3 . It is a paid application that requires approximately 1GB of free space. If you already own the original PC version
The PCGamingWiki recommends "ThirteenAG's Widescreen Fix" for modern resolutions, which is typically downloaded as a .zip file and extracted into the game directory. Downloads - Rockstar Games Download com rockstar gta3 zip