I have now waited over 25 minutes to open the Multi-User project template, and it will not move past 95%.  I have attempted this twice with the same result.  Other templates load without delay.

Update: On a third attempt I let it run for longer, and after about 40 minutes it opened.

Multiple users also report the same problem, in one case even waiting for an hour without it opening yet.  

Steps to Reproduce
  1. Launch the 4.21 editor to the Project Browser (with Datasmith installed)
  2. Open the Unreal Studio tab
  3. Make a project from the Multi-User template

RESULT: the pop-up quickly gets to "Loading... 95%" and then stops.

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ComponentUE - Editor - Datasmith - Importer
Affects Versions4.214.21e0
Target Fix4.21
Fix Commit4493361
Main Commit4551290
Release Commit4493361
CreatedOct 9, 2018
ResolvedOct 22, 2018
UpdatedJan 16, 2020