How can I install a downgraded apk without root?

I recently purchased a Moto Z Play Droid Edition which is incapable of being rooted or the bootloader being unlocked. In an attempt to remove bloatware, I have removed several apps. I managed to "uninstall" apps following , however without root, that merely disables them from the user.

I have used an old version of Google Calendar for several years, and I wanted to be able to install the same .apk that I have used, however Google Calendar was installed as a system app on Stock Android, so I would need to downgrade it. When I try the simple commands of "adb install -r -d -f calendar.apk" I get [INSTALL_FAILED_VERSION_DOWNGRADE]

Because I was unable to fully uninstall the Google Calendar app that came with the stock ROM, there must be some remnant that prevents me from installing an older version.

Is there any way to progress and install this apk? Do I need to change something in the AndroidManifest.xml in order to proceed? Is that even possible with a Google app, which is most likely encrypted?

Any other suggestions?

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