The log has entries for Daytime; you may still have an entry for Fortnite Creative 1.0 DayTime(SkyDome).
This does not get removed automatically to be converted to the Verse version and therefore causes errors.
see the post Fortnite Ecosystem v31.00 with Known Issues - The Day Sequence Devices
Freezing at 33% is a common Validation processing point and can be seen by Windows Task Manager being 96% CPU busy.
Have you checked that all the Refences to the FAB store are working in the example these take over 500 seconds to load from the new items see below for the project layout.
You may have to delete the References directory if you cannot start the project
@HeyPickledDave 31.20 has just come out with new functions to identify and fix problems