Each purchase of dslrBooth grants you one license. You can activate each license on a maximum of two computers.
Windows updates can cause a computer to appear as a new device. To fix activation issues, deactivate ALL existing computers in fotoShare.co.
If you need to deactivate the license on a computer, you can do so at fotoshare.co > Licenses > Activations. After deactivating, you can activate the license on any computer.