Unfortunately Microsoft have not released Windows 8.1 as a standalone update or provided a direct link to a Windows 8.1 .iso. Dell will likely only be able to send you a Windows 8 Reinstallation DVD as Microsoft made Windows 8.1 Reinstallation DVDs reject Windows 8.0 product keys (there are workarounds but you still need to obtain the installation media which Microsoft have made difficult to obtain). This has been a major inconvenience for Windows 8.0/8.1 users. 
I’ve email dell Tech Support And ask For A win 8 Install Dvd with product key So I Can update Win 8.1. I Got no reply's from Dell. Do I email dell again ask will Help Me update to win 8.1 I like To be Mail me require material’s as  installation media,what your recommendations . :emotion-11:  I have A dellxps 8500 ,intel core I7-3770 3.4 Ghz standard chipset communications internal sound Windows 8.0 64 bit  ie-10,and other internet software. 16gb RAM, GeForce650 2gb Have Norton 360 and  Motorola 2210-02 dsl modem have att dslHardware  have 6 usb 2.0 and 4 usb 3.0 ports, 6 internal usb  16x dvd burner and dell wired Mouse A i-rocks KR-6820E back lit key key board, dell a speakers dell ax210 usb speaker Dell E2313H 23 monitor canon mg8220 inkjet printer  
please Help win 8.1 Update