I have a paid subscription for Avast antivirus. One of my mobiles has Kitkat 4.4.2 and after resetting the mobile I was unable to reinstall avast - "your device is not compatible with this version".
The post from Avast staff on 7th March 2019 doesn't seem to be correct.
I have been an Avast Customer from 2006, I hope something can be done
Thanks
Well a post from over a year ago, can't really be held as true today.
Whilst you had it installed on your old phone, without any changes I guess it could still work. However, you say you have reset your mobile and if you have gone to the Google Play store, it would have the latest Avast Mobile Security version. This would be incompatible with your old mobiles Kitkat 4.4.2 OS.
The only way I can think it might work if you were able to get a copy of AMS version 16.6.4 as a .apk you might be able to install that. From where and how to install the .apk file I don't know.
The only source for old .apk files I found was this one
https://avast-mobile-security.en.uptodown.com/android/versions for 4.0.8139 the last before AMD 5.0.
EDIT: That said I really don't know if this old versions would be getting virus definition updates even if you got it installed.