Chosen Solution
I have an iMac 20" 2.4GHz Core 2 Duo (Early 2007) I want to get the new updated MacOS Sierra on it. It won’t let me! So is there any other way to go around this other than the app store?
I’m working on it. Keep you eye on this question. I’ve been sick the last week or so due to new medications but should be back at it shortly: Installation of High Sierra 10.13 on unsupported Macs However, I don’t believe I’m going to able to do it on the early 2008 machine and earlier. I’ll be going for a 2008 MacPro first. Lat year I got the early 2009 machine to Sierra and it was not supported, so we’ll hAVE TO SEE.
Sadly this is just not possible! First the Core 2 Duo based systems are only 32bit and you need a 64bit chip (i Series) & 64bit clean BIOS (EFI). Even if you could get it to run using a thunker service (I don’t know of any) you would run into RAM and graphics limitations. Time to get a newer system if you really need the newer OS.