GAME CRASHING FIX
This will block fnf from trying to check for updates and stop crashing the game. Make sure you have your games in a location they will stay in.
Open settings > Network and Internet > Advanced network settings > Click Windows Firewall > Click Advanced settings
You should be on the app that looks like a brick wall with a little globe behind it.
At the top left, click on Outbound Rules > New Rule on the top right
In the New Outbound Rule Wizard, Click program > Next > This program path > Click Browse and find your Funkin.exe > Next > Click BLOCK THE CONNECTION > Next > Make sure all checkboxes are checked > Next > Name it whatever you want, preferably something recognizable (mine is FNF update blocker) > Click on Finish and then you're done.
Alternative easier, but non-persistent method: just turn off wifi bro
I made an account just to share this, I hope it helps. Repeat this for every mod you install and merge with the base game and you're good.