Windows 10 Pro has Downgrade Rights to Windows 7 Pro. The ACPI Tables in the UEFI BIOS contain a MSDM for Windows 10 Pro (with 25 digit unique product key) and a SLIC 2.1 for Windows 7 OEM SLP. More details here: [URL]
Hey there! can someone tell me what the following part number indicates? 619-ALWX : Windows 7 Professional (64Bit Windows 10 License, Microsoft Volume License) Win7 is preinstalled. As far as I can see there is no Win7 Sticker on my machine but a Win 10 Pro Sticker. Does this mean that Win7 and Win10 use the same license? Thanks  
619-ALWX : Windows 7 Professional (64Bit Windows 10 License)