'using System.Deployment doesn't exist?

I've tried looking for System.Deployment to use this code in my Blazor Server application: enter image description here

But System.Deployment is not in my project system, nor in the available Project References, I looked on Google to find a downloadable .dll link and Microsoft doesn't seem to have it. What am I missing? I've tried using System.Deployment and using System.Deployment.Application, neither works.

My project references, available libraries



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