Thanks again borate for your effort and response. I think I'm going to give up on this one. I don't want to waste your time any further.
"Apparently the successful stabilized file is included in your link above" - Yes, but with sound unprocessed or (still processing)
I tried again, can't find any sign of progress indication anywhere?? (I must say a shortcoming I found in some other processes as well)
My hardware: (Maybe the software is hardware sensitive)
Asus VivoBook
Intel i5-8265U @ 1.60Ghz (8th Gen)
Windows 10, 64-bit (update = current)
Total SSD storage = 595 GB
Memory = 8 GB
Intel(R) UHD Graphics 620
St B