Of course, the problem is that my iMac can not run any version of MacOS later than High Sierra (i.e., Apple doesn't support a later version of MacOS on my Macintosh hardware). So I need to buy a new Mac computer. Since Apple is in the process of switching from Intel-based Macs to Apple Silicon (i.e., ARM)-based Macs, I don't want to buy a new Intel-based Mac which will have a limited life. It is much more reasonable for me to wait until I can buy an ARM-based iMac. It seems only reasonable for Intuit to continue supporting the 2020 (and possibly 2021) versions of Turbotax on High Sierra until Apple has completed the switch of the Mac product line to ARM-based computers - to avoid forcing Turbotax users to buy new computer that will have a limited life.
