Backups
Thanks for the guidance, I will improve this. I now understand the importance of this.
Back to the issue…
Now from the backed up version, (a backup just recently done the day before I did the wrong try of the installation of Klarna Checkout), I tried to install Klarna again. Now I got error on everything 
as you see here:
Do you have any advice where to go to understand how to solve these problems one by one. Cron Jobs are running well, no error logs what I can see and the Cron Jobs are setup by the hosting company. I have a good contact with the hosting company and their “service” is to provide a ready-to-go-installed basic version of Magento. So I cannot install it by myself with this hosting company (they are very known in Sweden so I dont think they should dare to do a bad job but lets see). Anyway, the have also setup the cron jobs like this through the hosting admin panel:
Thank you again for your support 