Apk availibility of previous Ring app versions

It looks like the latest version Ring Always Home app is not supported on Android 8.0.0 and unfortunately I cannot update my phone to a more recent Android version (LG G6+ with locked bootloader).
However I noticed a previous Ring app version (3.49) is compatible. Is there any official Ring repo where I could download the apk for this version ? (I found it on unofficial repo such as apkmirror, apkpure, etc… but I’d rather avoid these untrusted sources)
Best regards,

The only version Ring is distributing is the one in the Google Play store.
Yes, unfortunately, with the cell phone industry phones only get updates for a couple years. You might look into the manufacturers that are supporting their phones 3+ years for your next one.
For myself, I typically don’t upgrade my phone until I’m forced to by an important app that I need to keep support with, such as banking.