Forum Update as Usual?
 

When updating from 3.8.x to 4.0.x, after you have disabled all custom mods and skins, is it a simple matter of upgrading as if you were upgrading from 3.8.4 to 3.8.5? Or is there more to it than that? I have yet to find somewhere that gives you step-by-step instructions on updating from an older version.