But on some upgrades (although I don 't think this happened with Monterey), you have to force reboot. Lastly, be patient, sometimes nothing seems to be happening and a couple of hours later, the step is done. And Monterey is pretty mature-no one mentioned any ongoing problems, although no doubt there are a few.
Not clear on why someone emptied their email. The simplest way to open a DVD player in MacOS Mojave 10.4 is through Spotlight: Click Command + Spacebar to bring up Spotlight (or click the little Spotlight icon in the upper right corner of the screen) and search for DVD Player, then press Return / Enter to turn it on. You can drag and drop DVD Player to your Dock, and then with a right-click on the DVD Player Dock Icon, tell its options menu to Keep in Dock. Click on your Desktop to make Finder frontmost, and press shift+command+G keys to pop the Go to Folder dialog. Apple USB SuperDrive is one branded playable/burnable CD/DVD drive which is the perfect complement to your iMac or MacBook Pro. Apple has placed it in /System/Library/CoreServices/Applications. But I upgraded to an M1 and that was a step too far. Open the DVD player in MacOS Mojave Easy Way: Spotlight. Official Apple DVD player - Apple USB SuperDrive. I had one, Intaglio, that people had found a work around for. To explore the DVD Player User Guide, click Table of Contents at the top of the page, or enter a word or phrase in the search field. Triple check for ways to run your outdated app. You can use DVD Player to watch movies you created with another app, like Final Cut Pro.
The precaution on checking for 32 bit apps is good. If you’re using digital audio output, you control the volume on your audio equipment.
One thing I used to do is install on another boot drive, but that has become a real pain because Apple requires you to authorize, add iCloud, etc, so you end up with another device (in other words another boot drive on the same computer makes it a new device in Apple’s mind). If changing the volume in DVD Player doesn’t work: Suppose you set the volume to the maximum level in DVD Player, but it’s still too low.Choose Apple menu > System Preferences, click Sound, then increase your computer’s volume using the Output volume slider. I ran Monterey on a 2013 MBP and it worked fine (not that you asked). The usual make sure you have a couple of backups.