I have successfully done the following: Integrated French (fr-FR) language pack to Windows 8.1 Enterprise en-US (x64). Integrated French (fr-FR) language pack to Windows 8.1 Enterprise en-US (x86). Combined the above 2 into an AIO. I was able to install any of the 4 operating systems to install without requiring the serial number (image only contains enterprise sku). The problem now is that I have a Windows 8 64-bit installation. I want to upgrade it to 8.1 using the disc. When I put the disc in, it complains that I need to insert the 64-bit disc. Is there anyway to make my AIO image support upgrades for 32-bit and 64-bit?