The instructions are there, but that gamemode is older and will likely have issue with the plugins being so out of date, that the gamemode tries accessing them like they were the old plugin, where the new plugin has a lot more features, and a few ways of doing things in different ways than prior.
If it's saying things like 'Expected 10 params, got 12', or that certain functions cannot be found (Error 19) then you'll have a lot of upgrading of the gamemode to do.
Being that the pwn file is 1.3 megs, I'd say this will be more work than it's worth.
If you're keen, have a look at some other gamemodes.
https://sampforum.blast.hk/showthread.php?tid=604530
This one was made long ago, and ended up being updated by another. It's rather cool, but does take some effort to setup, the effort in the long term will be worth it, just learn from the process.
Another here
https://sampforum.blast.hk/showthread.php?tid=654448
