One purchase, both builds. Your key from the receipt email works on either — one machine at a time.
After installing: open Kyu, paste the key from your receipt email, press Get started. He walks you through the rest in ten minutes.
Moving to a new computer? Open Settings → License on the old one and press Forget, then paste the key on the new one.
Windows SmartScreen may show "protected your PC" the first week after a release — press More info → Run anyway. The installer is signed; SmartScreen just hasn't seen enough installs yet.
No key yet? Get Kyu — $9.99, once. The key arrives by email the moment you pay.
Trouble?
getkyu.ai@gmail.com