Because PhotoImpact X3 is no longer actively sold or supported by Corel, you cannot purchase a new key directly from the official store.
Search for "Corel" or "PhotoImpact" in your old email accounts for order confirmations or registration emails that contain your original key. photoimpact x3 activation key
If you previously purchased and registered the software, log in to the official Corel website and check your registered products list to find your existing serial number. Because PhotoImpact X3 is no longer actively sold