Well, it was because of the addition of Game Jolt support in the 1.4.3 update. But, I have finally released an open source version of 1.4.5 with Game Jolt support removed in it so players can once again create mods on the latest version of Baldi's Fun New School Remastered. Here is a download link: https://www.mediafire.com/file/xhue7e7r6aa2vnr/BFNS_Remastered_OS_Project_1.4.5..... And when you do make your mod, I would be interested in checking it out.
Viewing post in Why was version 1.4.5 not open source?
Thanks for letting me use it, I might use it to make Baldi’s Brand New Game Plus in the future, and I WILL give credit, I’m not one of those jerks who steals things. You can check on my mod, Baldi’s Brand New Game. I used some assets that other people made and I gave them credit in the mod’s credits.