Do a reinstall, clean install, of Mountain Lion to its own drive - leaving the one you have as is. Would be nice to have cloned 10.6.8 to another drive for backup and safety, and in case you need to dual boot until you get everything updated if necessary to be ML compatible.
If your Mac is set to allow apps from the App Store and identified developers, and you try to install an app that isn’t signed by an identified developer and—in macOS Catalina and later—notarized by Apple, you also see a warning that the app cannot be opened.
When installing applications, Mac users can sometimes encounter a message stating that the particular program 'Cannot be opened because the developer cannot be verified.' The same warning message also can be described as a macOS cannot verify pop-up. If your Mac is set to allow apps from the App Store and identified developers, and you try to install an app that isn’t signed by an identified developer and – in macOS Catalina and later – notarised by Apple, you also see a warning that the app cannot be opened. Then click “Open Anyway”, now you can open the installed software. Step 3: Click “Open” to open the software. In some cases, you want to run a software, the Mac system may ask you to enter your Mac password to make sure you want to run this software on your computer, just enter your password of your Mac, such as: Then you. Fix installer can't check it for malicious software/malware on macOS Catalina 10.15 using the commands given here: https://www.winytips.com/installer-cant-be.
SU is Apple.
You have a Mac Pro 65 lb tower? so you would have 4 drive bays inside to work with backups and dual booting.
Upgrading the OS over the older does cause issues, especially due to change in code and drivers and dropping support for PowerPC based and drivers that were not 64-bit.
http://www.macupdate.com/app/mac/7032/carbon-copy-clonerCreate an OS X Lion Install disc
How to clone your system:
May 8, 2013 11:12 AM
Problem:
After upgrading to macOS Catalina, some mac users found that some apps can’t be opened because Apple cannot check it for malicious software. A dialog box pops up, click 'OK' button and the application will close.
Mac Application Cannot Be Opened
Solution: Make sure you have dragged the installer package to /Applications to complete the installation. Our users have found that dragging the package into the Applications folder works best. This package appears after the installer .dmg file is opened.
Problem:
Mac Os App Cannot Be Opened
If you try to open the installer you downloaded, and you are blocked by the Mac System. You may need to disable the gatekeeper within your system preferences. You may see a prompt like this:
Solution:
1. Go to “System Preferences” then “Security & Privacy”. Under the General tab, you will see a message at the bottom, “Application HX Edit was blocked from opening because it is not from an identified developer.”
2. Click on “Open anyway” and the application will be opened.
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