New PSU install not loading

Ran the new 4.0.8 installer however the Web UI is not working. If anyone ran into this problem before could you let me know how you fixed this?

“The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.”

Product: PowerShell Universal
Version: 4.0.8