I upgraded and found that out too. I'd say there is not going back with out dumping your existing data because it moved every thing into a single database with NPM as well as changed a few table names. The only way I can think of a roll back would be to use a backup copy of you SQL databases from before the upgrade and then uninstall NCM 7.3. In reality it's probably less work to move forward and fix the ACL's
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