Problem SOLVED!!!
Downgraded Slimjet back to version 25.0.10.0 (Chromium 78.0.3904.63) 64bit and Hurray!
With that (older version) VSO Downloader works again
So - sometimes older is better!!!
My Op system is Windows 10 Pro 64bit version 1909 and there was a new update in night between 20 and 21 May. After that update downloaded and istalled all that my PC (was an obligatory restart required!) all tha mess happened. May be the new Windows 10 update is reason, why VSO Downloader now refuse...
I would like to ask about compatibility with Slimjet browser. Until May 20 VSO Downloader worked OK with Slimjet browser, when streaming video file opened in Slimjet, it was recognized by VSO downloader. Now on May 21 - VSO downloader does not recognize videos, opened on Slimjet browser any more. Sl...