I'm tentative posting this work-around and trust @Phil@Dan will moderate if needed.
Out of interest which country are you from?
One option would be to use Aptiode. From Wikipedia: 'Aptoide is a software "marketplace" application for installing mobile applications which runs on the Android operating system.'
Aptiode is not available in the play store to install directly to your phone but you can download and run the APK from their site to install it. Aptiode is open-source and has been around for almost a decade but some due-diligence is advised if you decide to go this route.
Once you have downloaded the app, navigate to you phone's file manager>downloads folder and click the APK file (a warning will appear but this happens with any APK you install this route).
Once installed, open Aptoide and search for iVMS-4500.
Aptoide sources files from various repositories and this is where you need to be cautious.
Aptoide can't always source the APK's directly from the developers so when you download make sure it's from a 'Trusted' source, indicated with a green shield icon on the app's page.
That is a good alternative. I had IVMS 4500 installed and erased it, during some tests.
Meanwhile I am checking on 4500 HD, but I get a beautiful, "Failed to get push token" message, when I try to turn on notifications.
Hikvision is saying about that:
Error: Failed to get push token. [Possible reasons]
In the phone’s Notification Center, the app push is not allowed. [Solutions]
Allow the app to push messages in phone’s notification center.
There is a new version on Hikvision App Store Version: 4.7.12 Update at: 2020-07-01 13:49:35,
but not at the playstore, that still has previous 4.7.7 29/10/2019.