Help needed. Google play games app not updating. Says App not installed.

I downloaded the apk file from the wild coz i have some issues downloading apps from play store. Whenever i try to install it says app not installed at the end. Cant even update from play store. I use a galaxy grand prime on lollipop and all latest system specs.I really need it asap. Pls help me out :) :(

I would strongly advise against installing apk from the wild. It can have viruses or who knows. You need to install the play store version of the app in order to update it from the play store. You can try to clear cache and app data on the Google play store app