Further update to previous post.
The 'Un-install' process is not clearing up and leaving files in place in various folders
and Windows 'Desktop' and 'Start menu' Icons /Tiles remain in place.
Wasn't a very good (complete) process previously but this version very poor.
Hope this of use.
Managed to load it ('600' build) by uninstalling 528 etc and after a few tries...(quite a few pauses
during install with not much going on).
When program opened got a 'Note'/Message at bottom of interface frame in 'grey area' that looked as if it should not be visible......namely .......
New Key=.....WebBrowserCx X86 Cef...r3.2785...1486......g8c4ba9f.....build 105 date......
also 'Wrong url context' in Message box.
That's not the full code that was shown but enough of it for you to make sense of it?
(..........'s account for some of the bits I have omitted above).
Hope this helps. I understand it's a pre-release version which probably explains the above.