SCCM Client Upgrade Options Perform Automatic Client Upgrade

How to update ConfigMgr clients automatically… in SP1 – Modern Management Blog

ConfigMgr client automatic site assignment behavior in a multi site environment - Modern Workplace Blog

Automatic Client Upgrade greyed out – CTGlobal

Upgrade to ConfigMgr 1511 in your hierarchy - MSEndpointMgr

SCCM Client not upgrading when installed from OSD : r/SCCM

Client promotion =/= client upgrade : r/SCCM

Automatic Client Upgrade

SCCM Pre-Production Client Deployment

Migration Upgrade from SCCM 2012 to Current Branch (1902)

SCCM - Client Upgrades Are Deploying Really Slow after Update - Cory Fiala