Doesn't show any GUI on Windows 7

[opusforlife2]

Running the app only opens a process (as seen in the Task Manager), not an accompanying GUI. Is it not intended to work on Windows 7?

I tried the latest release, 0.5.0. Then I tried 0.4.1 just to check. Neither works.

[LordRibblesdale]

Update: I've deleted my last comment, because the program works, but it is by default reduced to taskbar icon.
On Windows 10 2004 and version 0.5, if I click on icon, it works and shows GUI (but strangely, the icon is automatically hidden by default)

[opusforlife2]

Oh yeah. XD There is an invisible icon.

The program doesn't work for me, though. If I try to merge two images into a PDF, it just goes on forever, not showing any result.