Needed to transfer files to your Vita's memory card via USB or FTP.

You will need the game files from the original PC version of GTA Vice City. You must own the game to obtain these files legally. How to Install GTA Vice City on PS Vita (Step-by-Step)

You should now see the GTA Vice City icon on your LiveArea. Launch it. The first load may take a moment while it processes the files. Features of the PS Vita Port

You must own a legal copy of GTA Vice City for PC. The port requires the assets (audio, textures, models) from the original game. You can use files from the classic Steam version or the original CD-ROM release. (Note: Files from the "Definitive Edition" remaster will not work).