Is it possible to import from vB 3.6? I've tried running the importer (which just specifies 3.7 / 3.8) but when I press "import user groups" I just get
A server error occurred. Please try again later.
I do have a copy of 3.8.2 to upgrade to if I want, but am reluctant to at the moment as it will totally break my forum's styles and I'd like to make sure XenForo works well before closing off the old boards.