Perf Fighter runs on Nexus client whereas Fallen's superheater is on powerbots client which is different. Powerbot.org is where you can download their client and run superheater.
People will tell you to not use powerbot cause they hack and its a bad client and whatnot, however; people say its bad cause most of the scripts are of bad quality. Fallen's superheater is a good quality script and I have used it to get 3 accounts to 99 mage. Just use it as soul wars so randoms aren't a problem and don't save account info to the bot, manually input it to be safe.
Ps. I use rsbots.net and perf fighter and not powerbot. That is with the exception of fallen's superheater for all nexus superheaters suck.