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Originally Posted by salamanderjuice
FYI it is possible to run earlier versions of MacOS in a virtual machine like Parallels or VMware Fusion to run apps stuck on an earlier version. Performance can take a hit in VMs though but if it's something lightweight it shouldn't be an issue.
2014 Minis are somewhat compromised due to the soldered RAM and the fact they are limited to being dual core machines unlike the 2012 or 2018 versions.
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The problem is that you can't run a version of Mac OS on hardware that came out after a later version of Mac OS was released. High Sierra came out in Sept, 2017. Thus gen 4 mac mini's and later that came out in 2018 won't run Sierra. I can't install Sierra on my Macbook Pro, which came out in 2018.
I can boot my iMac in Sierra, but running from an external hard disk is somewhat slow. Running my iMac that way was my back up if the old mac mini went belly up. I prefer to run my iMac with the latest and greatest and I certainly don't have enough space on the internal hard drive to dual boot.