If you see this "Error: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem." First, make sure your program is installed under Program Files/Topaz Labs or Program Files/Topaz Labs LLC
If your program is installed in an unusual place such as Microsoft One Drive or the root directory of a drive this can happen as Windows may not allow your host editor to access the files it needs.
If this is the case, please remove the faulty installation manually by deleting the folder, and reinstall your program to [DRIVE]/Program Files/Topaz Labs or [DRIVE]/Program Files/Topaz Labs LLC