Some people prefer an older version of a certain app, therefore they disable auto updates, which leaves it in your play store always there to remind you to update.
The solution I found that worked for me is to get the app apk, save it into your internal storage, uninstall the app, then download zipsigner from play store, find the apk in your internal storage, resign it using zipsigner, then reinstall the resigned apk. This will detach the app from the play store. Play store will not detect that you have that app installed.
Of course you will need the pre update apk, so hopefully you will have it in an old backup somewhere if you need to do this.
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