generally i woul dtry to resote the backup to the latest version of 6.11 which is 6.11.4, see if that makes a difference
I found a similar case with a similar message and there license activation resolved the issue.
So first activate the license, then restore the database.
Had a similar case.
When licenses were activated, issue was solved.
What you can do is that you can try with Trial Licenses maybe and see if it works (so you don't have to wait till other licenses will be activated/sent).
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