Hello,
if you don't want to use a vm or web navigator it's also possible with Wine or CrossOver.
Just a create a x64 bottle, install SmartPSS and configure the NVR or Camera(s).
Tested on 20.04.4 LTS (Focal Fossa) 64-bit and CrossOver 20.0.2, nothing to report or something else to install.
Enjoy...