Which version of GTA are you trying to play—the native PC port or the original PSP version? Further Exploration Detailed installation instructions can be found on the TheOfficialFloW GitHub
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Note: The keyword contains "I---", which is interpreted as a typographical variant of "ISO" (a common disc image format) or "iOS" (Apple's mobile operating system). Given the context of GTA: Vice City and the file extension (a package format used primarily for PlayStation Vita games), this article will address both the legitimate method for PS Vita devices and the necessary security warnings regarding unofficial downloads.
The classic GTA: Vice City (2002) was never ported to PSP. PSP had Vice City Stories (a different game).
Locate your legally owned PC version of GTA Vice City (e.g., from Steam). Create a folder named inside the directory on your PS Vita. Transfer your PC game files into that ux0:data/gtavc Install the VPK to transfer the file to your console. Open VitaShell, locate the VPK, and press to install it. First Launch Launch the new game bubble from the home screen.