The process is now to make a donation of at least 6€ https://ko-fi.com/tolriq then send me your trial ID by PM on Ko-Fi.
Do not write anything about license or your trial ID publicly there.
You can find your trial ID at the bottom of the purchase page in Symfonium.
This cost more than the Play Store price, but since demand is higher than anticipated this is way too much time consuming for me 