The reason why some illegal versions have missing audio is that they are ripped versions, which are made as small as possible, to save on download time; a 1GB copy of GTA3 can be made into a 250-300MB rip by just blanking the radio files, which is then distributed as a series of RAR files with a batch file acting as a setup program.
Ripped versions do have problems such as exception errors or crashes due to missing or modified assets, so my best bet is to buy a legal version instead...
i have a legal version of gta but i dont think its v1 i think its v2 but when i downgraded it still blue screened on me?