It looks like the versions on the App Store do not support 8.0.0.
The solution would be to either upgrade your project to 8.1.0 or above, or to load the the version 2.0 module into a Mendix 7 project, upgrade that project, export the Object Handling module, and import it back to your new project. I’m guessing you already have version 2.0 in your project though if you upgraded from Mendix 7.23.4.