The error is explicitly telling you to install the file, so let’s try to do exactly that. Sometimes the file exists in a temporary folder, but the system isn't opening the installer automatically.
This error is most common on:
In work profile scenarios, you might need to install MIDIag.apk in both the personal and work profiles. The error is explicitly telling you to install
If you cannot find the file in your storage, the system might be "confused." It thinks there is a pending installation when there isn't one. Clearing the cache of the system component responsible for installations can break this loop. This error is most common on:
The original app may still think the APK is missing. In work profile scenarios, you might need to install MIDIag
This error usually appears in the following contexts:
An Over-The-Air (OTA) update may have attempted to install new diagnostic tools. If the automatic installation failed (due to storage space, corruption, or security settings), the system flags the pending install.