I kept trying to find the non-purchase spin too and even tried dm in twitter to get an answer. Today the link showed up in the official rules. Here it is -
https://www.bwinstantrewards.com/register-for-token.php
We have had bad luck with all of our family members' accounts. Out of around 20 spins from all members, only two spins won - one 1,000 and one 100.