Microsoft Dynamics GP 2013 Beta release available for download – do I really have to add anything to this announcement?
Microsoft Dynamics GP 2013 Beta release available for download – Inside Microsoft Dynamics GP – Site Home – MSDN Blogs
Install, Upgrade & AdminMicrosoft & the GP EcosystemGP 2013
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.