Keep in mind that 6.7.13 version of the Play Store app is a very dated one. (Current version being 26.x.x) So you're likely to experience a lot of limitations when trying to interact with Google's current online Play Store service. Also, version 4.x.x of Android being very dated and no longer supported by Google, there isn't a lot of third-party developer support at this point neither. So finding apps that still work with Jelly Bean are still floating around in the Internet, but you'll probably find it easier to sideload APKs from sources like apkmirror.com than on the Play Store. With the caveat that apps that run just on your mobile device are one thing, apps that have to interact with online services will be more problematic.