Cannot install NuGet package even though it is listed
I had a package that I wanted to install listed in the NuGet packages list but after clicking install, it seemed to wait a bit and then do nothing.
HOWEVER, clicking back onto the output tab in Visual Studio (since it was unhelpfully changing to the Error List tab), I noticed that there was a constraint that didn't allow the installation. In my case, the Microsoft.Net.Compilers package was too old for the NuGet package to install.
Once I saw that, it was easy to install the NuGet package after updating the other one!
HOWEVER, clicking back onto the output tab in Visual Studio (since it was unhelpfully changing to the Error List tab), I noticed that there was a constraint that didn't allow the installation. In my case, the Microsoft.Net.Compilers package was too old for the NuGet package to install.
Once I saw that, it was easy to install the NuGet package after updating the other one!