Run the Windows 10 Digital Licence Generator and activate Windows 10 permanently.

Info:

    Almost all Windows 10 versions are supported except windows 10 1507 and server.
    This activator does not install any files in your system.
    Windows update must be enabled at the time of activation
    Internet connection is required for instant activation, but if you’re running it offline then the system will auto-activate at the next online contact.
    Use of VPN, privacy and antispy tools may cause problems in successful activation.
    Unless hardware is changed, the system will auto activate the retail version of Windows 10 upon windows reinstallation, but if windows 10 VL version is used in that case you’ll need to insert its product key in settings activation page to regain activation upon windows reinstall.

For Making Preactivated Windows 10 iso
Use Poweriso software to open your windows 10 iso. Now copy the $OEM$ folder from here and paste it in sources folder of the iso. The directory will appear like this iso:sources$OEM$ Now click the option save as in poweriso