We are happily running unicorn in VS2015 with Sitecore 8.2, but we need to bring in some items from a Sitecore 7.2 instance. Unfortunately I cannot get Unicorn to install via NuGet. Every time I try, it errors out on Rainbow with this message:
Install-Package : Could not install package 'Rainbow.Core 1.4.1'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.5.1', but the package does not contain any assembly references or content files that are compatible with that framework.
I don't see anywhere that a particular .NET framework version is required. SC82 is running on 4.6.1, but I don't think I can do that for SC72.
I've also tried installing Rainbow by itself first, which attempts to install 1.4.2, but that fails with the same error.
Lastly, I tried adding the NuGet package with a new Visual Studio 2015 project created by the SIM tool and it errors out with the same message (except it is using .NET 4.5)
Anything I can try?