Yes, you can update the Hexnode app without disabling the kiosk mode on Android devices.
In the case of Samsung Knox, Kyocera Business Phones and Android devices with Hexnode MDM as a system app, enterprise apps can be pushed silently. So, the latest version can be uploaded in the app inventory and deployed to devices.
If the device is enrolled in Android Enterprise, the enterprise apps are to be published as private apps in Managed Play Store for silent installation.
Navigate to the Apps tab and click on +Apps > Enterprise App.
Select the platform, category and upload the new APK file. Click Save.