Cannot upgrade 1.5 to 2.2 until "all XenForo database tables are removed"

[jamesder]

I've copied all of my XF 1.5 stuff over to a staging server and that's working great. The DB imports and everything works fine.

I've downloaded the xenforo_2.2.8-Patch-1_xxxxxx_xxxxx_upgrade and followed the instructions. When I get to the install page, I am told

Oops! We ran into some problems.​

You cannot proceed unless all XenForo database tables are removed."

I don't want to delete all old threads, users, etc...just trying to update from 1.5. to 2.2.

Googling and searching...

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