I show you a quicker and easier way to install Windows 8.1 on an unsupported PC by using Windows 7 install media.
Also I show you how to convert install.esd files to install.wim files.
BTW I haven’t tested it, but if you use the PAE patch, Pentium IIIs may work also? In Theory if you don't have NX, SSE2, or PAE this should work for you.
Special thanks to woellie123 / @woellie123
For the base idea and some of the files!
Zip file
https://mega.nz/#!fN0EUAjY!85fDqtMPcv...
Commands (For install media commands, just follow the tutorial)
bcdedit /enum
bcdedit /set {default} NoIntegrityChecks Yes
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