2 additions:
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I was wrong regarding the missing dll in the 110\DTS folder. It is in place, I just checked on the wrong drive as I had SQL Server installation folders on C and D.
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I could solve the issue by opening the packages and replacing all the version numbers of the component directly in the xml (Version=1.0.0.0 -> Version=1.2012.0.0) (Other option would be to delete and re-add the components in VS/Data Tools but that would be a lot of work in my situation due to reconfiguration of the adapter components)
