Compatibility Report: Direct upgrade from Windows 8.1 to Windows 11!



A friend asked me to upgrade his two laptops to Windows 11. The newer laptop ran Windows 10 64-bit, so I naturally made sure all drivers are updated and no conflicting application runs (such as third party antivirus). I started Windows Setup and at the first screen, before proceeding I deleted the file C:\Windows~BT\sources\appreserres.dll from setup cache to bypass compatibility check. Setup upgraded Windows 10 to 11 withing minutes, as the laptop is fast (Intel Core-i7, 8GB RAM, SSD).

I then switched on the second laptop (Core 2 Duo, 4GB RAM) and I realized it runs Windows 8.1! I removed any conflicting application, made sure all drivers are updated and decided to try to upgrade Windows 8.1 directly to Windows 11, without upgrading to 10 first. I started Windows Setup again, deleted the file C:\Windows~BT\sources\appreserres.dll from setup cache to bypass compatibility check and clicked on next. I expected to see an error that I cannot upgrade to 11 directly and offered a clean installation, in which case I would upgrade to 10 first. Surprisingly enough I was offered to upgrade directly from Windows 8.1 to 11 keeping all my friend's data and applications, so I proceeded! So far it has completed 18% because it is very slow, but I will report back when complete!

So you cannot upgrade directly from Windows 7 to 11, but you can upgrade from 8.1 to 11! If I ever get the chance I will try to see if you also can upgrade directly from Windows 8 (not 8.1) to 11, but I bet you must first upgrade to 8.1 or 10. Needless to say that all Windows Vista/7/8/10 64-bit drivers also work in Windows 11 so no worries here.
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My Computer

System One

  • OS
    Windows 10/11 Pro 64-bit (was Windows 8.1 Pro 64-bit)
    Computer type
    System Manufacturer/Model
    Custom build
    Intel Core i7 3770 3.40GHz s1155
    Asus P8H61 full ATX s1155
    2x Kingston 8GB DDR3 1600MHz Hyper X Blu
    Graphics Card(s)
    Asus GT 620 1GB DDR3 PCI-E
    Sound Card
    Realtek HD audio
    Monitor(s) Displays
    Sony 19" TV (VGA connection)
    Screen Resolution
    1440X900 60Hz
    Hard Drives
    480GB SSD (one for 10 one for 11), 4GB HDD for data
    Old white case (to hide I actually have a modern PC)
    Intel CPU fan
    OEM PS/2 keyboard (to save USB ports)
    OEM PS/2 mouse (to save USB ports)
    Internet Speed
    VDSL 50MBps
    Internet Explorer 11, Microsoft Edge
    Windows Defender
    Other Info
    Dual boot Windows 10 and 11 (change boot priority). Windows 11 installed with compatibility check bypass hack in Legacy BIOS mode, no TPM, no Secure Boot. For details visit Elevenforum