To activate n.player, you should go to Help->License Manager:
Once purchased, you receive the activation code. You should type the code into Set the Activation Code field.
To protect your activation and make it possible to restore the activation key in the future, it is recommended to secure the key with a password. Set a password into Enter a Password field (button Show makes the password visible). Then it is recommended to link the password with your email - it is an address that n.player will use to restore the password to activate a license in the future.
Then, to activate the code, you should click Activate License. If your PC is online and the license server is available, the license will be activated.
If your system is offline, you can activate your license in a different way. You should create an activation request file with Create Offline License File (make sure that all the above information - the activation code, the password, and the email address - are set), then send the newly generated file to support@nablet.com. We will process the license request and response with an activate license file. Once you receive it, you should start n.player, go to the License Manager, and press Install activated License File. Then you should select the received file, and the license will be activated.
For trial use, you can request an evaluation code with Request Eval Code button.