In terminal I tried several combinations with Mozilla, firefox and Thunderbird, without succes. But with Zypper, I could install Audacity and Conqueror. So I can work on Internet!lol!
But after rebooting and trying to install by using the menu, I get still an error. But now the message is different. It says:
This goes a bit over my experience with fixing YAST (it might just be a simple fix but I haven’t ran into this one), please open a new thread in the https://forums.opensuse.org/english/get-technical-help-here/applications/ forum and explain the setup, the machine, what .iso you used to install and post the error message and stuff there.