This is a common thing on most phones, because the app is not official and from the play store it will flag it up that it may be risky and the unregistered file may contain malware and be dangerous, it is not. If you don't want to install it that is fine, however we are very very safe.
I think I saw somewhere that you fixed elder chaos druid kills not tracking, they still don't track
Looks like tracking was fixed on the Elder Chaos Druids for their rare loot but general KC tracking is still playing up, will be re-added to be looked at.