It's been cracked in the last week, so you can skip the sign-in and play it again! archive.org is your friend if you want to try out this pre-Assetto Corsa engined mini-game (I paid for it back in the day, so am happy I can play it again, even though it's just a hot lapping experience).
Of course I believe the content is being/has been ported to Assetto Corsa, but if you want to try it in it's original state, you now can!