It’s here! Dynamics GP 2016 is now Available
Do I really need to say more? Follow the link for the PartnerSource and CustomerSource download locations.
It’s here! Dynamics GP 2016 is now Available – Microsoft Dynamics GP Community
Microsoft & the GP EcosystemGP 2016
Archived post from 2016. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.