Getting "Upgrade Required" error message in SharePoint 2013? Well, Ideally, We have to run the SharePoint Products Configuration Wizard on
the server(s) right after installing the service pack/patches.
In Windows Server 2012, SharePoint updates are part of Windows Server Update. It installs patches but never runs Products configuration wizard automatically! You still have to run psconfig wizard to complete patching!
- Install the patch binaries
- Run psconfig wizard manually.
If you get any errors while running psconfig, the next step is to force SharePoint upgrade with this command line:
psconfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures
To apply patches on SharePoint 2013, Follow my step by step guide at: SharePoint 2013 Patching Guide - Step by Step
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