Fallout 4 Creation Kit version 1.10.163 , the most prominent officially added feature was the Virtual Workshop
The vast majority of legacy mods on Nexus Mods were designed for 1.10.163. fallout 4 creation kit 110163 full
Since Steam typically only offers the most recent version, you may need to use the Steam Console to "downgrade" or download the specific depot for version 1.10.163. Fallout 4 Creation Kit version 1
: This is often caused by an outdated mod structure. Try launching the CK with a clean Data folder to identify if a specific mod is causing the hang. Fallout 4 Creation Kit version 1.10.163