Why not 1.20.4 or 1.20.6? Many mod developers froze on 1.20.1 due to internal code changes in later patches. So Forge 1.20.1 remains the for large modpacks.
Here is a detailed guide on how to safely download and set up Forge 1.20.1 for free. 1. Requirements Before You Start Minecraft Java Edition: descargar forge minecraft gratis 1.20.1