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You've always been allowed a testing site. (And we've actually just made some license agreement tweaks which make some of the stuff in this feature clearer, but also allow any number of testing installs, provided they are clearly test installs, password protected, etc -- previously, our agreement only allowed one. The customer area has a license agreement update notification.)

Because of testing and development sites, the URL related checks are warnings and don't block the auto upgrade system. (If you get that warning on a production site though, then you may be doing something that falls foul of our agreement, so best to sort it/talk to us.)