It appears that Orage no longer comes with the latest version of the Xfce desktop environment (4.16). It might have been dropped because it's no longer maintained and was last updated in 2019. So it's not so much an MX thing but an Xfce thing since MX-21 has the latest Xfce version.
While Orage is available as a package you can (maybe) download and install, it's for a previous version of Debian, too. So no telling if it'd work. If you want to go down that road, let me know. I'm not sure you can just click it to install since it won't install a repo but there is a way to install a local package via the terminal.
There is a panel item you can add called Xfce timer if you're looking for the alarm and timer features. There's also an app called Osmo that might be a good replacement. What were you looking for in the app that you needed?
This looks like a separate support query, assuming it is a query and not just a sad story.

I hate when a program you like is dropped. It's like finding out a new TV show you like won't have a second season.