I purchased a lifetime license during eM Client 9. How many devices does my license support?
Normally that includes only one device, unless you initially purchased a multi license at the time
You can usually see that via going to “Menu / Help / License” near the bottom.
If you can’t see that, suggest to either email [email protected] or [email protected]
Or if you still have an active paid account go to the VIP support page and login and lodge a support ticket for that info.