Activate Windows 10 via (CMD)
Sometimes Windows cannot be activated via the interface Without third-party Windows 10 activation tools, you can activate Windows 10with CMD for free. You can open the command prompt in two variants under Windows 10: With administrator rights or as a user with limited rights. Some actions performed in the command line require extended rights. In such cases, you can then specifically start the Windows 10command prompt as an administrator. 
1. Start the command prompt as administrator (right click): 
2. Write the following code in the window: slmgr -ipk XXXXX-XXXXX-XXXXX-XXXXX (Instead of XXXX, please enter the product key) 
3. The key must then be activated. Write the following lines in the command prompt: slmgr -ato 