VS2019 officially started, the first question can not create a project that looks very similar to the previous update VS2017
Solution
https://github.com/Microsoft/msbuild/issues/4286
And the last question is exactly the same
https://www.cnblogs.com/kileyi/p/10772269.html
gacutil /u "MSBuild, Version=15.1.0.0" gacutil /u "Microsoft.Build.Conversion.Core, Version=15.1.0.0" gacutil /u "Microsoft.Build, Version=15.1.0.0" gacutil /u "Microsoft.Build.Engine, Version=15.1.0.0" gacutil /u "Microsoft.Build.Tasks.Core, Version=15.1.0.0" gacutil /u "Microsoft.Build.Utilities.Core, Version=15.1.0.0" gacutil /u "Microsoft.Build.Framework, Version=15.1.0.0"