Are you considdering purchasing or upgrading to QuickBooks 2013?
The following download links are available to you. It does not require any key codes and is valid for 30 days.
Pro Trial version:
http://globalsmallbusiness.intuit.com/downloads/UK/QuickBooks/2013/dls/r6/QuickBooksUK2013Trial.exe
Premier Trial version:
Enterprise Solutions 13.0: