To install the UII NuGet Packages, open a Visual Studio project and open the Package Manager Console.
Enter the command:

Install-Package Microsoft.CrmSdk.XrmTooling.CoreAssembly
This will install the following assemblies:

Then, install the UII Common package:
Install-Package Microsoft.CrmSdk.UII.CommonAssemblies
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More information:
- https://www.nuget.org/packages/Microsoft.CrmSdk.XrmTooling.CoreAssembly/
- https://www.nuget.org/packages/Microsoft.CrmSdk.UII.CommonAssemblies/

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