every search i did on the subject sent me to links related to the Windows client and nothing else.Googlable easily.
How much time it takes for them to respond, usually? As you know I dont have much time, and I got no answer at all until now, only an automated reply.email to support@mikrotik.com and explain in short, that you upgraded to v6 and lost key. indicate the purchased SoftID and the current SoftID