4. Run Polybrush, enter your name and copy hardware-id
Better to use short english names
5. Only after payment send your info and wait for 1-year or lifetime license key at email
All keys generated manually special for you.
6. Run polybrush with admin rights and register it
This key will work during the year for all Polybrush updates.
After that, you need to buy a new key.
This is associated with the fast development of Polybrush.