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Added information about supported frameworks that I gathered from the NuGet package. I added this info because the lack of this info has started to create problems.
I just downloaded the package and took a look at it. The package requires .Net 4.5. The last nuget package that supports .Net 4.0 is version 0.4. I'm not sure how stable it is, but you could install it if you want to. To install it, run this command in the Package Manager: Install-Package StacMan -Version 0.4.0.0
Is the project you are trying to install the package into targeting .Net 4.0 Client Profile or the full .Net 4.0 Framework? Based off this error, StackMan requires the project you're installing it on to target .Net 4.0 Framework, not the Client profile.
