Error 6 trying to start Showeditor

I ordered 2 laserprojectors and in anticipation of their delivery I wanted to test the Showeditor software.
I downloaded Showeditor V7.1.N version on the laserworld website. After installing this version I tried to start it. After setting the language to english the program presents a popup window in german saying: "Fehler # 6 in frmHaubt TestbildLaden" with gives me the option to retry or cancel. I clicked retry at least 30 times with no resolve. Clicking cancel shuts down Show editor.

I have tried a lot of things but I have not found a solution yet.
The most extensive thing I tried was to:
Step 1 - uninstall Showeditor.
Step 2 - deleted the following folders:
C:\Program Files (x86)\Showeditor_V7\
C:\Users\<username>\Documents\Showeditor_V7\
C:\ProgramData\Showeditor_V7\
Step 3 - reboot the system
Step 4 - Install Showeditor V7.1N again
Step 5 - Started Showeditor and answered the questions for language "english", no updates and use opengl
But after closing the window informing that Showeditor is running in freeware-mode a few seconds later the "Fehler # 6" window appears again.

Any suggestions are greatly appreciated!!!!

This is on Windows 10 version 21H1 build 19043.1526 in dutch/nederlands

Yess deleting the 2 files did the trick!!! Thank you for the fast response Erich!!!!