This is a genuine Windows 8.1Professional 1 DVD and a genuine Certificate Of Authenticity. Once activated you can obtain all the Microsoft updates from the Microsoft update website 
 
Each purchase includes: Original COA license Product key Installation DVD for Windows 8.1 64-bit professional 
 
For All PC Brands ~ Dell, HP, Acer, Asus, Gateway, Lenovo, Samsung, Sony, Toshiba and more 
 
All-in-One DVD Install Reinstall Recovery Repair Reboot Restore Reset DVD Disk 
 
compatible with MICROSOFT