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There is a reason why Apple choosese not to support the new Mac operating system on older Macs.
Older Macs just don't have the necessary components or power required to cope with the demands of the more modern systems.
That includes most of the old-style Mac Pro models (unless you have upgraded the GPU inside). Apple said that would run happily on a late 2009 or later Mac Book or i Mac, or a 2010 or later Mac Book Air, Mac Book Pro, Mac mini or Mac Pro.
With the patch installed you can go back as far as early 2008 models.Remember that we're going against Apple's official advice on this one, which means that if something goes wrong - and that's always a possibility with an OS install, even if you're using official software - your warranty is unlikely to save you. Installing mac OS Mojave via the Patch Tool will stop Wi-Fi working if your Mac has a Broadcom BCM4321 module - which includes certain configurations of the Mac Pro3,1, Mac Book5,2, Mac Book Pro4,1, i Mac8,1, Macmini3,1, and Mac Book Air2,1.Of course, it's unlikely that your 2008 Mac would be under any warranty so that may not worry you too much. Dosdude1 suggests installing a new compatible Wi Fi card in your machine if this is the case.It's unlikely to run like a dream, which is why Apple advises against this course of action.But you should be able to achieve tolerable performance.