Installing High Sierra onto 2019 iMac is possible?

komatsu

macrumors 6502
Sep 19, 2010
499
36
The original OS for the 2019 iMac was 10.14.4, so nope
And Apple used to be fairly good at producing backward compatible OSes.

Just another way Apple is making the lives of users more difficult!
 

chrfr

macrumors G3
Jul 11, 2009
8,519
2,739
And Apple used to be fairly good at producing backward compatible OSes.

Just another way Apple is making the lives of users more difficult!
You're misremembering. Macs have worked this way since the beginning. This would be more of a forward compatibility situation than a backward compatibility one.