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VSIXUpdateReferencesInTemplateFiles

Updates all reference versions of the format:
<#@ assembly Name="$(SolutionDir)\packages\EntireOne.Shared.T4.2.2.25.1\lib\net45\EntireOne.Shared.T4.dll" #> to actual, used in packages.config

Activation from main Menu:

or Context Menu in Solution explorer

Irrespectively on which project in solution command was invoked. It will update all projects in the solution.