Thank you Steve and BigJohnny,
I found the hack that I'm looking for:
https://vborg.vbsupport.ru/showthrea...thread+starter
It's called the first post on every page of thread hack in case anyone else is looking for it.
Let's say i have a few forums and I want to upgrade all of them to version 3.6.1, is it possible to install all the hacks and then create the databases/modify the forums after?