No.
This is an unofficial fan expansion that acts as a "total conversion".
: A PSP running custom firmware (CFW) and the plugin files placed in the Memory Management gta iii psp
The SILC mod isn't just a simple port; it’s a reimagining that bridges the gap between the two versions of Liberty City.
There are three ways, and none are official cartridges: There are three ways, and none are official
Place the ISO in the ISO folder of your memory stick. For PS Vita users, these files are placed within the Adrenaline environment.
If you searched for hoping to download a single ISO file and drag it to your memory stick, I have bad news. The perfect port doesn't exist. However, here is the pragmatic fan’s guide to GTA III on the go: The perfect port doesn't exist
Some players use plugins like the Right Analog Stick Patch on the PS Vita to modernize the controls.