Thanks for all of your replies! And very sorry that I myself am just getting round to reply to
you today! (I was busy doing many things, but was not at my computer.)
I realize now that my question did lack a bit of background information, which I'd like to provide.
"Where did you download it..?"
The new version was automatically downloaded by an "updater", which I have now identified as the "UDT Updater".
And the current Avast message is that Avast has interrupted the connection to update.am.de because it is infected with "URL:Blacklist".
I have searched the web for the UDT Updater have found a link, here
https://www.vlc-forum.de/thread/3264-udt-exe/which states
1) that the UDT Updater is automatically installed with VLC whenever VLC is downloaded from the German VLC website, and
2) that Avast identifies the UDT Updater as a threat.
The suggestion under that link is simply to deinstall the UDT Updater, which is what I have done. I hope that that solves the problems.
Again: Thanks to all for your helpful remarks!