You will get the key for the release version at or around 2018-02-13, via the profile page.
You should be able to download the launcher still as far as I am aware. Are you using the ‘warhorse’ credentials, and not the forum ones?
@DrFusselpulli may be able to assist if you are still having trouble.
You missed the 26th November date for changing the platform, which was mentioned in the email sent out early in November. It might be possible to ask nicely and get a change, especially if you are digital only. I can’t say if this is possible though.