Hexnode will let you downgrade the Enterprise app on Android devices by uploading the lower version in app repository.
For the lower version to be installed on the device, the app (higher version) must have been pushed to the devices via Mandatory app policy:
Navigate to Policies-> Android-> App Management-> Mandatory Apps and click Configure.
Select the option ‘Enforce app downgrade’ and click on +Add to add the desired app.
Associate targets and save the policy.
To downgrade the app:
Go to the Apps tab and click on the enterprise app to be downgraded.
The app detail box appears. Click on the gear icon.
Select ‘Edit’ from the drop-down list and click on Change next to the APK file.