SPSUpdate is a PowerShell script tool designed to install cumulative updates in your SharePoint environment.
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Required because this module now implements class-based resources. Class-based resources can only work on computers with Windows rManagement Framework 5.0 or above. The preferred version is PowerShell 5.1 or higher, which ships with Windows 10 or Windows Server 2016. This is discussed further on the SPSUpdate Wiki Getting-Started
Impersonation is handled using the Invoke-Command cmdlet in PowerShell, together with the creation of a "remote" session via New-PSSession. In the SPSUpdate script, we authenticate as the InstallAccount and specify CredSSP as the authentication mechanism. This is explained further in the SPSUpdate Wiki Getting-Started
For detailed usage, configuration, and getting started information, visit the SPSUpdate Wiki
A full list of changes in each version can be found in the change log