Why Wont Apk Install
Close & reopen the play. If you tried all the steps above but still can’t download apps, try the steps below. A) type in control panel on the start page. The reason it wouldn't install was the apk not being signed.
Close & reopen the play. Don't update, do a clean install. Make sure that you have enough storage space. What you could do is either find a different.apk file or perhaps you have forgot to enable permissions in order to install 'unknown apps'.