My first call would be to the company that supplied the PC, can they supply W10 on a dvd or usb stick, with licence key, at a reasonable price..
Alternatively go click here - If you go here you will need to download the iso file and burn it to a dvd - this will then give you a bootable dvd which you pop into the PC and boot. Installation is then a case of following the on screen prompts, enter the provided licence key when prompted to do so.
The link is to an OEM - Original Equipment Manufacturer version, as usually supplied only with a new PC. Technically the licence is for that PC only.