Why do you don't fix the 1.12.2 installer, but 1.5 or 1.11? The 1.12.2 is one of the biggest Mod Version together with 1.7.10 and you destroyed it? There are so many nice Mods that have only support until 1.12 because the 1.13 changed everything.
I mean, its your decision but its really sad that you destroy many nice Modpacks like ATM 3 or SkyFactory 4
I was able to load the world and play on it for a few hours and now this is all I get when trying to load into the world now...
All the mods are in except Optifine.
Sorry if I didn't supply enough info.
- Debug logs -