When you buy a standard consumer license for Windows 10, you can only have it activated on at a time . While you can install the software on multiple machines for a trial period, only one will be legally licensed for long-term use per key. License Types and Computer Limits
The number of computers you can eventually use a license on depends on the version you purchase: How to Transfer Your Windows 10 License to Another Computer
When you buy a standard consumer license for Windows 10, you can only have it activated on at a time . While you can install the software on multiple machines for a trial period, only one will be legally licensed for long-term use per key. License Types and Computer Limits
The number of computers you can eventually use a license on depends on the version you purchase: How to Transfer Your Windows 10 License to Another Computer