The Support and Services team explains Microsoft Dynamics GP 2013 – Version Checks & Upgrades
Microsoft Dynamics GP 2013 – Version Checks & Upgrades – Dynamics GP Support and Services Blog – Microsoft Dynamics GP – Microsoft Dynamics Community
Microsoft & the GP EcosystemPayables & ReceivablesInstall, Upgrade & AdminGP 2013
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.