I think I may have mis-stated in my original question that I was trying to go back from Mojave to High Sierra. So, I just want to be able to run my new and more powerful MIni with a one terabyte SSD and lots of RAM with an OS that the rest of my networked Macs run on (all on Sierra). The rest of the Macs in my world are only recently running Sierra after running ElCapitan on them all through Sierra's release. The problem with High Sierra and Mojave for me is the switch to the APFS file system and with Mojave, 64-bit technology, both of which are incompatible with my older favorite software and Time Machine backups. I know the new features that come with the latest OS are great, but at almost eight years old, I just don't use them and thus, don't appreciate them. Once I just re-partitioned any new drive to have only one partition, then the Mac would accept an install of an older OS and that was true of everything from old style drives through Fusion and SSD drives. I just always assumed that was where the link to the factory OS was which kept you from installing an older OS. In the past I have found that what I referred to as the hidden emergency install partition had to be wiped to install an OS older than the the one that came with the Mac. But Mojave may be the first to prohibit that sort of tinkering. Over the years, I have done it successfully several times between OS's Mountain Lion through Sierra on various Macs, mostly MacBook Air's and Mac Mini's. I can say definitively that you can go backwards as it were from an OS that ships with a Mac. First, I have every MacOS install on USB stick from Mountain Lion through Mojave so the lack of being able to access these older OS installs is not a problem. Wow.lots of great help here.thanks to all who replied.
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