i would like to upgrade to a paid subscription but your system says my gmail address
firstname.lastname@example.org is registered to an "au" and that i need an address in 'your country' (what ever that means)
whats the problem with my address, i want to use this one
It should only matter where your billing address is, you have to pay using a card that has a billing address in a country FormsCentral supports purchasing from. I think that it can make a difference what locale you have your FormsCentral account set to.
This is a list of the countries you are able to purchase FormsCentral from (billing address): http://forums.adobe.com/docs/DOC-1375
This FAQ can help with unsupported country purchasing errors: http://forums.adobe.com/docs/DOC-2984
If that does not help, the error you recieved sounds strange and I can't imagine anything about your Gmail address is relevant, can you send me a screenshot of the error you see to email@example.com and include a reference to this Forum post (Subject or URL) in your email.