mountain lion

I need to install a version of Mac OS X Mountain Lion to run some legacy software. I have downloaded the DMG file for this older operating system, but I cannot find a way to create a new virtual machine with it in Parallels 18 on my MacBook Pro. There must be a way to do this. Please advise.

I was using Parallels 16 on my iMac to create a VM for MacOS 10.8 Mountain Lion. It asked for my Apple ID and password, which I entered, but I lost the 6-digit verification code (another story), so am stuck on the page requesting the code. How can I restart the installation process for MacOS...

2018 MacBook Pro macOS Ventura 13.3 Parallels Desktop v17.1.16 Guest OS X Mountain Lion 10.8 I have some legacy software that integrates with hardware. I need to run 10.8 or less. Parallels message "Unable to detect operating system" when I try to install OS X Mountain Lion 10.8. If I continue...

I have two questions. 1. If I install Parallels 15 on my OSX 10.13 volume, and I already use a bootable OSX 10.8 volume, can I get Parallels to boot the older Mac OS, WITHOUT having to re-install the older Mac OS? Currently I switch between the two operating systems by using System Preferences >...

I decided to install a Mountain Lion guest mostly for the purpose of viewing what software design was back in the day. I know around this time, @2x graphics were introduced. How can I view these on the guest instead of the normal resolution graphics?

I'm using Parallels to run Mountain Lion so I can use Extensis Portfolio which is no longer supported with the current OS. Running into an issue where trying to select multiple items using the standard select the first item, then "shift click" the last item in a group that I want to select...