Razboth14 wrote on Feb 15^th, 2021 at 5:31pm:

i know its ip based on ip but my ISP or router have dynamic IP, so everytime i restart the modem it always generate a new ip.

I have always thought it was based on the computer, not the IP address, even though the IP address is noted for the each time it is activated, otherwise, every time you started your computer with a different IP, you would have to reinstall the 767 II again (this would apply to all Captain Sim products). Having said that, if you want to stop the amount of activations from reaching the limit because of complete reinstalls requiring activation, then use the Manual Offline Activation method. That would prevent you from having to contact Captain Sim to unlock them as often - you would still need to activate it (Instant Online Activation, or Manual Offline Activation) again if you upgraded your computer, or bought a new one.

I'm not sure if this is what you mean, but if you want to do a complete reinstall that requires it to be activated again, you need to delete the key_y763.dat file for the 767 Captain II. This file is found in the C:\Users\<YourUserName>\AppData\Roaming\CaptainSim\y763 folder.
You can access the C:\Users\<YourUserName>\AppData\Roaming\CaptainSim folder by typing %APPDATA%\CaptainSim in the Run command window - you can open the Run command by pressing the Windows Key + R.