Thank for your reply. As you were so adamant about wine 4.0 being archived and Wine 6.0 being offered on the download page I scrutinized my configuration and discovered that the WineHQ key was registered but the link to the WineHQ repository not. Apparently I made a mistake somewhere in the process ...

My contribution on how to get Adobe Digital Editions 2.0.1 working on Wine 4.0 was refused, allegedly because Wine 4.0 is considered outdated. But I just recently downloaded it from this very WineHQ website. It is what you get when using the download for the Ubuntu 18 that is the basis for Mint 19 t...