Dear Evert @evert.homan_scilifelab.se,
what is the issue you are experiencing? If you cannot install them at all, could you post the install error (here I describe how to obtain it)?
I installed the nodes (see first screenshot below) and I have used the checked update sites in the second screenshot. Just so that you can double-check that you have the same update sites.
Lastly, which OS?
Best regards
Steffen