Hi @Terry Poupart ,
Welcome to Microsoft Q&A!
Which version of Visual Studio are you using? what is your project’s target framework?
I tested on VS 2022 Community version 17.6.4.
I can successfully install the Microsoft.VisualStudio.Web.CodeGeneration.Design
package and Microsoft.CodeAnalysis.Features package
by right-clicking on Project > Manage NuGet Packages.
And the Microsoft.CodeAnalysis.Elfie package can be installed as a dependency.
It is noted that the Microsoft.CodeAnalysis.Elfie package can’t be installed separately for now.
Sincerely,
Anna
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