Hello! I understand you're having trouble finding the MyKronoz ZeTime app in the App Store on your Mac with OS X 10.15.7. Let me help clarify the situation and offer some guidance.

First, although you might not be seeing the app directly in the App Store app on your Mac, the ZeTime app is still available for iOS devices like iPhones through the Apple App Store online. Here is the direct link to the ZeTime app on Apple’s App Store for iOS devices: ZeTime on Apple App Store. This app is meant for pairing with the MyKronoz ZeTime hybrid smartwatch.

Since your device is a Mac (OS X 10.15.7), please note that the ZeTime app is not designed as a macOS app but rather as an iOS app for iPhones and iPads. You will need to use your iPhone or iPad to download the ZeTime app and pair your ZeTime smartwatch.

If you do not have an iPhone or iPad, or if you previously had the app installed and cannot update or reinstall it, you might want to check:

1. If the app is still installed on your iPhone or iPad, try to update it from there.
2. If you cannot find the app in your usual App Store region, try switching the App Store region to places like Saudi Arabia or Germany, where the app is still listed.
3. Make sure your iOS device is updated to a version compatible with the ZeTime app.

If you’re experiencing issues because MyKronoz’s official support and forums have been discontinued (they closed forums around 2020), it could make support a bit more limited.

Could you please let me know if you are trying to get the app on a Mac, or on an iPhone/iPad? And do you currently own a MyKronoz ZeTime smartwatch? This will help me guide you more precisely.

Are you satisfied with this initial explanation? I can help you further depending on your device and setup.