How do I get NuGet to re-install/update all the packages in the packages.config?

Reinstall all packages in project:
Update-Package -reinstall -Project YourProjectName
Reinstall package “Antlr” in project:
Update-Package -reinstall Antlr -Project YourProjectName

See more here:

The following command will update all packages in every project to the latest version available from nuget.org.
Update-Package
You can also restrict this down to one project.
Update-Package -Project YourProjectName
If you want to reinstall the packages to the same versions as were previously installed then you can use the -reinstall argument with Update-Package command.
Update-Package -reinstall
You can also restrict this down to one project.
Update-Package -reinstall -Project YourProjectName
The -reinstall option will first uninstall and then install the package back again into a project.
Or, you can update the packages using the Manage Packages dialog.

Source: How do I get NuGet to install/update all the packages in the packages.config? – Stack Overflow

 

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