You say you’re working on a Windows desktop app, so I guess that might be why you’re not using WSL.
If (and I realise this is really more than one biggish ‘if’ so may not be relevant) your main need for Windows Elixir/Erlang is a single desktop app project, you could stay on the latest stable versions on Windows, and use WSL (where you can install asdf) for everything else.
