Greetings,
The call recording feature is definitely working on ÍEMUI 10.1. You might have received the error message 'App not installed' because an earlier version of the call recording app is still on your device. The P30 Pro was released with a native call recording app pre-installed. If you upgraded your device to EMUI 10 and then to 10.1 and haven't performed a factory reset since then, the old app is still on your device. As it was written above and in a similar thread post (
https://forum.xda-developers.com/sho...&postcount=105), the call recording feature was preserved on Indian region devices even on EMUI 10.1. In other regions, the feature became disabled after the EMUI 10 update. The official Huawei communication is that the call recording feature was disabled after the EMUI 10 update due to data protection laws and regulations. However, the India region apk can be installed on EMUI 10.1. and it is working perfectly.
So, if you haven't performed a factory reset since the EMUI 10 and 10.1 upgrades, you should uninstall the old call recording app.
1. Go to Settings>Apps>Apps.
2. Then in the top-right corner tap the three-dot menu and tap on 'Show system processes'.
3. Scroll down to an app called 'Recorder'. There might be two apps with this name. One is the Sound recorder app and the one with the android bug icon is the old call recorder.
4. Uninstall the Recorder app with the green android bug icon.
5. Install the downloaded apk.
6. Finally, reboot your device. The call recorder should work now. You might have to grant permissions (for me all permissions were granted upon installation). The recorded files will be in Sounds/CallRecord.