If you own the original UMD, you can use a compatible disc drive (like certain PC DVD drives with custom firmware) and software such as UMDGen or Imgburn to create the ISO, then compress it with 7-Zip.
(Note: Always scan downloaded files with an antivirus before extracting. If the link is down, please leave a comment below so we can update it.)
: Use a tool like ZArchiver to extract the .7z file until you get a file ending in .iso .
: Modified textures and models to replicate parts of Los Santos, San Fierro, or Las Venturas. CJ Character Model
