BugMeister said:
- isn't there a bug in Edge which hangs downloads at 99%.. (?)
Yes there was, it is fixed in build 14332 (but Edge doesn't work for the update catalogue site anyway so it is kind of moot...)

Here’s what’s fixed for PC
<snip>
•We fixed the issue where some large downloads may appear to get stuck at 99% completion in Microsoft Edge.
Insider Announcing Windows 10 Insider Preview Build 14332 for PC and Mobile - Windows 10 Forums