I have tried a few times now to upgrade to the trial for the forms central to print off the forms submitted as we need them for a business meeting tomorrow. It keeps saying my account is registered in the UK and I need to register a new one but I've already had people submitting my form.
How do I upgrade to the trial?
Take a look at this FAQ and see if it helps to clear it up - I think basically in your case you need to be going to the same countries Adobe Store as your account is associated with. Maybe you set up the account with UK but are trying to purchase from the US Adobe Store - the regions need to match, the FAQ will explain more:
If that doesn't help you I can get you in touch with a Support team member who can assist.