No forge 1.21.1?

[Katuxire]

the mod i have doesn't have a neoforge or fabric, it needs architectury api to load and i need it to be 1.21.1 to be compatible with another mod and there's no forge version for architectury api in that version

[cassiancc]

Ask the author to port to NeoForge or Fabric instead. The greater modded Minecraft community has moved on to NeoForge, and mods still on OldForge are a rarity at this point.

As an aside, since Architectury API does not support 1.21.1, the author could not have actually made a mod for 1.21.1 that requires it.