Unable to install older MacOS versions on Desktop 20 (M4)?

For software development I sometimes need to develop software older MacOS (or even OSX) versions, like 10.12 for example.

Recently I learned to brute way that this is nor possible as such. Similar for older versions of Windows 7 and 10.

It seems that Dekstop 20 does not accepted to start or work with older PVMs I used in Desktop 19 on my MBP x86. While the stupid thing is that Windows 11 (ARM) can deal with older x86 software. So some conversion would be expected and appreciated.

Can anyone share a light on why not or how to overcome this ?

 

Anyone ?

 

This is mostly an Apple Silicon limitation. If you were using an Intel-based Mac with Parallels Desktop 20, you'd be able to install and setup legacy Windows and MacOS. As of the moment, it is simply impossible to run x86 VMs or OS ( except Ubuntu on Rosetta ) in Apple Silicon ( M-series Macs )