How to stop side loaded app from showing up in Google Play asking for an update

I'm running a Moto X 2013 (XT1053) with 4.4.4 stock rom and currently not rooted. For years I've use the gallery app called QuickPic. This app was recently sold to Cheetah Mobile, and I've decided that I just want to stay with the last version by the original developer and not update this app anymore. I uninstalled QuickPic from my phone, deleted the entry from the Play Store list of apps currently or previously installed, and then side loaded the appropriate apk for the version of QuickPic I'm interested in keeping. When I go into the Play Store, it is still showing QuickPic for update. I didn't think side loaded apps were associated with the Play Store. Can someone clarify or suggest a method to disassociate this app with the store.