The 1.16.5 version of PI on curse forge is requiring Redstone Flux 1.12.2 as a dependincie. This is throwing an error when loading the game.

RedstonFlux-1.12-2.1.1.1-universal.jar is for an older version of Forge and cannot be loaded.

Not sure if this has been reported or fixed yet. Thanks for any help.

That shouldn't be possible. CurseForge might be messing up, but the definition that PI provides doesn't require the RedstoneFlux API.

Ok so it seems i just forgot to remove RedstoneFlux from the curse uploaded config. Pi does not actually need RF but if your using the curse launcher then it would probably complain.
Regardless it should be fine now.