Thanks... For me it did install even as it gave that warning. Maybe its something to do with having developer mode on or off.

Anyway, I build a new one without requesting that credential, so there should be no problems now:

<Removed obsolete beta>

If anyone else tried installing the earlier beta I'm interested to know if it worked or not. I'd like to have request for that credential for open mode kernel support, but of course not if it's existence causes trouble with stock kernel.