Apper is available via Synaptic or via the terminal with:
sudo apt install apper
To run it, it has to be done via the terminal to get the GUI showing with root privileges:
sudo apper
I think you will agree it runs pretty fast!:
On the homepage of apper it is shown that apper is no longer supported.
Interesting, I get a 404 error page not found on KDE website when I click on 'Visit home page' in Synaptic. Looking at the changelog, it appears that the Ubuntu repo has used a Debian unstable branch to import it. Last update 2020. I first discovered it in Devuan and never had any issues with it.
IMHO, Zorin OS users should stick with the GUI OS upgrader option, that was made for them. I do not recommend using a Terminal upgrader, that is no longer supported or maintained.
Hi StarTreker, It's not a Terminal application, it is a gui, just needs the command to launch the GUI.
Also, it refers to upgrading applications, Not upgrading the Zorin OS release.
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Ohhhhhh, I can see how easy that was for me to misunderstand, since it involves terminal in the first place, OK then, thats not so bad then.
Oh my gosh, I really need my head examined today, defrag my nurons, so I can think clearly. Usually I'm on top of it, today I'm having issues.
Try using ext4 instead of ntfs for your brain. 
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On a review page when checking more info about it it mentioned the need for adding repos manually. Could that include the repo for Zorin base updates?
Apper relies on packagekit and therefor, your existing Sources (sources.list and sources.list.d). I do not know what that review page mentioned, but the only reason to need to add repo's is for third party package installations.
If you are referring to adding the Zorin Repository for the next release in order to upgrade the release; no Apper cannot perform a Release Upgrade.
Manually merely adding that release's sources, then trying to upgrade the release would lead to breakage, just the same as with Gnome Software, Synaptic, Software & Updates... or other package managers.
Each of these is a frontend for packagekit, not for do-release-upgrade.
I was not thinking about version upgrade, just in release upgrades/updates.
Erm... release upgrades are when you upgrade from Zorin OS 16 to Zorin OS 17, for example.
Zorin OS 17 is a Release.
Wrong wording on my part. What I mean is system updates not version updates.
3 exes formatted mine to fat32.
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Nooooo! Stacer's clean sweep function! 