title: dotnet run reporting '.NETFramework,Version=v4.8 were not found'
body: <p>Im getting the following error when running 'dotnet run' on my Mac <code>OS/usr/local/share/dotnet/sdk/5.0.300/Microsoft.Common.CurrentVersion.targets(1216,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks [/Users/tommie/projects/zzz/zzz/zzz.csproj]</code></p>
  <p>My code is from Visual Studio 8.9 and only supports up to 4.8 on the .net frameworks
  However when I look at the 'https://aka.ms/msbuild/developerpacks' 4.8 is not available.  Only 5.0 is available.
  5.0 is apparently supported in Visual Studio 8.10 but is not a formal release yet.</p>