These are special mods that expand Minecraft beyond the 32bit integer limit.
Note from Zeta: This mods is in ALPHA and is likely very buggy. I don't even recall if I ever added proper 64bit worldgen to this mod but I'm uploading it regardless. This mod is also unsupported, as in it won't get any bugfixes for the time being.
Note from Zeta: Some of these files were solely uploaded in a Discord server that no longer has any affiliation to Cursed Creations Inc. If you have any of these missing versions, please send them in the new official Discord server for us to upload them, as I kinda forgot to backup these files and lost the source code.
To install this first start off with downloading inf-20100630 from here. Manifold is necessary for these mods. Install Manifold as a JAR mod via the "Add to Minecraft.jar" option in MultiMC-based launchers.
Note: These versions are very CPU and RAM-intensive compared to their vanilla counterparts. Do NOT expect to have the same performance as typical 64-bit mods, even at spawn.