The Dynamics GP Support and Services blog continues their upgrade look with Microsoft Dynamics GP 2013 – Modified Dictionary Upgrade
Microsoft Dynamics GP 2013 – Modified Dictionary Upgrade – Dynamics GP Support and Services Blog – Microsoft Dynamics GP – Microsoft Dynamics Community
Microsoft & the GP EcosystemInstall, 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.