I understand the confusion! Did a few re-install rounds due to the different issues and basically the issues I've run into with Dataverse changed from time to time. This is the current status I have with Dataverse with latest installation round. Maybe I could be able to at least get the client open if I would try the installation again so basically just sharing the errors I've got for you to know.
This time installation was done a bit differently compared to the other installation rounds as it was done while logged in with my user account but using another (Admin) users credentials. Although I don't know if that could make any difference here.
So far the library disappearing at some stage and also being not able to run nodes have been the persistent issues when I've got the client to open.