"When Microsoft released Windows 11 in 2021, it also rolled out strict hardware compatibility requirements for the new operating system... If your CPU wasn't on the list of supported models, or if your PC lacked a Trusted Platform Module (TPM) that supports the version 2.0 standard, that upgrade failed."
"Among Windows enthusiasts, that compatibility check was more of a challenge than a roadblock, and they quickly discovered two ways to bypass the hardware requirements... Microsoft officially supports one of those techniques and allows customers to perform a Windows 11 upgrade on a system with an incompatible CPU by making a small modification to the registry."
"The second technique uses a crude but effective hack, replacing the compatibility appraiser module (Appraiserres.dll) with a zero-byte file of the same name... And as an enormous number of readers have reported, the technique has been effective on even ancient PCs."
"At the same time Microsoft rolled out Windows 11, version 24H2 on October 1, it also appears to have tweaked some additional settings that broke the second upgrade option."
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