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[Artemio]

Check the serial number prefix that you enter during activation.

If the serial number starts with NC50AS, that's the license for nanoCAD 5, if the serial number starts with NC230AS, that's the license to activate nanoCAD 23. Each product must be activated with the corresponding serial number, it is impossible to activate nanoCAD 5 with the serial number from nanoCAD 23, and vice versa.

You can get license serial numbers in your personal account on the website nanocad.com (panel on the left).