when upgrading the docker image for webgrabplus, it updates it to 4.2.2 beta. That new version requires DotNet and not Mono and it seems not work properly.
update.sh tries to find the .exe file in a non existent /bin folder.
Just sharing in case there are plans to include DotNet in future versions of the docker image for webgrabplus.
Meanwhile I am rolling back to 3.x version.