I am really confuesed about PERP is it possible to get hold of or even to buy?
It’s a leaked gamemode.
So is there any way of getting hold of it?
Yes but don’t expect any support in it. Also do note that Pulsar Effect, the original developers, are not very pleased about people hosting PERP servers and are sending DCMA takedown notices to such servers. There is also news of them bringing people to court.
unless you enjoy getting sued, or you are planning to keep the server top secret for only you and your close friends (not for the public, which ruins the entire point anyways), dont host a perp server of any version.