If you have lost your key, Nikon generally cannot replace it if it was from a physical disc that wasn't registered. However, you can attempt recovery through these official channels:
Even if you find a serial number online that appears to work, it is almost certainly a key that has been flagged by Nikon’s (now inactive) activation servers. While CCP2 may accept the key during installation, future updates or OS reinstalls will cause the software to revert to trial mode (30 days). Worse, Nikon could theoretically issue a DMCA takedown for that specific key, though they rarely pursue individuals. nikon camera control pro 2 serial number
There was a pause on the line. "Let me check your account, Elias... It seems you were using a flagged key. That triggers a temporary hardware ban for security verification." If you have lost your key, Nikon generally
: Do not confuse the software product key with your camera's serial number , which is physically located on the bottom or behind the camera body. Nikon Camera Control Pro 2 Serial Guide | PDF - Scribd Worse, Nikon could theoretically issue a DMCA takedown
: If you purchased a physical copy, the product key is typically printed on a label on the back of the CD-ROM case or inside the original packaging.