Use APKPure App
Get Backup System/Downloaded Apps old version APK for Android
Backup any app installed in your system whether its downloaded or preloaded
Backup any app installed in your system whether its downloaded or preloaded
File save path: internal\Download \Apk\
Disclaimer :
This app is licensed under GNU v3 or later.
The source of this app can be found at https://github.com/axxapy/apkExtractor