Hello theducks, hello BetterRed,
thank you very much for your extremely quick answers! I didn't expect that at Silvester.
Although BRs hint regarding the environment variable didn't help to solve the problem, your answers lead me to think only about the permission aspect.
Then I remembered that I have installed a program called "ransomfree" that monitors file changes in the background. I had the idea that this program might check / lock a file when Calibre wants to delete it. After I had deinstalled that program the converting worked again. So thanks to your hints I could get rid off the problem!
But: I still think that the problem also had to do with the KePub Output plugin because I had absolutely no problem when I converted from epub to azw, mobi, docx,...
Thanks again and a happy new year!
Lemmi
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