LINQPad6.exe is framework-dependent, so you must install .NET Core 3.1 or .NET 5.

The *Console Runtime* isn't enough: you need the *Desktop Runtime* or the SDK.

*** You can check that it's installed by running "Download .NET Core.exe" ***

You should end up with the following folders:
   C:\Program Files\dotnet\shared\Microsoft.NETCore.App
   C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App

NON-STANDARD NETCORE INSTALLATIONS
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You can install or xcopy .NET Core to a non-standard location, such as c:\users\joe\dotnet.
This is handy if you don't have admin rights to your PC.

If you do this, be sure to set the DOTNET_ROOT environment variable to the folder containing dotnet.exe.
For example:

   set DOTNET_ROOT c:\users\joe\dotnet