For the Name & operating system, write down the name of the virtual machine. In my case, I will write down “macOS Catalina”. Select “Mac OS X” for the Type and Mac OS X (64-bit) for the version. For Memory, I recommend you to go with the 50-50 rule which is to assign 50 to 60% of your computer’s memory for the virtual machine.

MacOS update could not be installed - Jeroen Mols Dec 26, 2017 HELP! HD locked on reinstall! | MacRumors Forums Jul 18, 2016

Mac Installation Errors You Encounter and How to Fix Them

A key step for upgrading the disk on a MacBook Pro is to install a new operating system on the new drive, and then use Migration Assistant to copy over the old data. Depending on how you went about the work, installing Mac OS X on the new system may give you a message: OS X … How To Fix A Mac Stuck Installing a macOS Update, Catalina

Fixed: macOS Could Not Be Installed on Your Computer

Installing OS X 10.3 tonight and ran into this problem. I was installing to a 30Gb disk that used to have a copy of slackware on it so when I ran the installer I had to run the disk utility and erase the old disk.