I have tried installing ReplyMod so I can record speed builds, like Sips and other youtubers but it just crashes the game, any ideas?

Can’t help without logs, best guess, incompatible forge/mc versions, or some incompatibilities between other mods

OMG OMG OMG!!! it works thank you very very very very much you are more awesome than an awesome possum.

Looking at the "Replay mod" on curseforge, it only has a fabric 1.20 release, not forge, This Reddit post details how you can use Sinytra Connector to use the fabric version on forge.