Your first subscription includes your first computer plus a bonus computer. You can add additional subscriptions (computers) to this at fotoShare Cloud > Subscriptions > dslrBooth > Update plan.
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 > Subscriptions > Activations. After deactivating, you can activate the license on any computer.