Porting GTA IV's Liberty City to V is a feat few community projects in any modding scene can rival. We tell you about its history, honestly.
What the project is
Liberty City from GTA IV ported into the V engine. Most, if not all, of the IV map - roads, buildings, interior shells. All playable inside of V.
It is not an actual asset port. Both the legal and technical reasons for that are complex. Instead, what is shipped is a parallel rebuild.
Where it sits today
Conditional. Parts work. Parts don't. The status of the project changes with time. The honest, if vague, answer to 'can I play it' is 'depends on the build, the version, and how much friction you're willing to tolerate'.
It's out there, you can find it. Not a polished commercial product.