I found two posts about the error, not for CSF sadly, but it indicates the, just as the errors suggest, you are getting a blocking/locking occurring.
I’m assuming there is part of the sql side of things (DB Scripts Runner) that is making it fail. In the Aus CSF I see an Import_Einvoice scrript, not sure if it is the same, but it appears to operate on the EFTHead table.
It tries to add records into the EFTHead table. But they may be different to the Sweden CSF.
In the Aus version there are some preinstall settings for EInvoice in company maintenance that also need to be carried out, perhaps this is related.
Another thought did come to mind. In the AUS csf it mentions if you have multiple companies when installing the second solution file you only need to check the DELETE PREVIOUS INSTALL for the first company, all subsequent times you don’t… Are you multiple company?