Installing the template package(s) will override the available template package(s).
The following template package(s) are already available:
   Microsoft.DotNet.Common.ItemTemplates::%VERSION%

To install the template package(s) anyway, apply '--force' option:
   dotnet new install Microsoft.DotNet.Common.ItemTemplates::6.0.100 --force

For details on the exit code, refer to https://aka.ms/templating-exit-codes#106