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I downloaded the previous release from https://storage.z-wave.me/z-way-server/ and just did "sudo apt install /my/download/path/z-way-3.1.4_armhf.deb" without the quotes. I answered yes to confirm that I wanted to install and older version.

Same as @GokMasE and @otverber here. z-way-server not running, no PID. Rolled back to 3.1.4 and it works fine. Redo the upgrade just to confirm but same issue.
I'm on Raspbian Buster on RPi 3b+