Initially reported on codeplex here: https://casablanca.codeplex.com/workitem/409. There isn't a cpprestsdk.v140.winxp.msvcstl.dyn.rt-dyn NuGet package available. I'm not sure how nuget packages are being created since there are no nuspec files in source control. In any case, I will try to incorporate "casablanca140.xp.vcxproj" from the codeplex workitem and issue a pull request.