Quote:
Originally Posted by Katie1
IF they are Amazon eBooks then Check & see How many Devices are on the Account. Over 6 & you are Not allowed to Download to another device. Until you remove from another device. Check possible you have an old device that still on the account. IF you do then Delete the device You be good to go 
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Katie1,
You can have more than 6 devices. Most big publisher books can only be downloaded to 6 devices.
Some books have unlimited device downloads.
Though you are correct in if you want to put the book on a 7th device, you have to de-register one of the other devices that the book is on.
Also you would need to deregister the old device, not delete.
Note: The kindle apps count as devices.