Hello,
Sorry to hear you are having issues. For the garble text on Installation Windows, I believe, this was reported before and should be resolved on Fences 6 release version. As the "Not responding" during installation. I have not see this issue, also there was no other report on this one from anyone yet. Also, do know that Stardock do no support its product on Windows Insider Preview release. However, I have forwarded your finding to Stardock Support Team for their review.We appreciate your feedback.
Thank you.
Basj,
Stardock Community Assistant