You might also be able to encounter issues such as the app suddenly stopping due to undefined errors. If you are having issues when downloading videos with the latest ShowBox, then you have to uninstall the app and repeat the process using a bit older version such as 4.x. Just click the Install option to confirm when prompted to allow permission to the app to determine the location, read phone identity and status, and modify or delete contents of your storage.
You have to turn Unknown Sources every time you would allow the installation of a non-market app. However, it would depend on the version of Android or device you are using.
You just can’t find ShowBox from the Google Play Store to download and install the app. Go there and you will need to select install movie box++(its an ad free version)i just installed it but idk why i cant stream anything but i can download so its worth the trade off.Don't forget to go into setting>general>device management and trust the untrusted enterprise. The most recent version for Android is 5.01. If you are going to download and install ShowBox on your Android device, make sure that it has at is at least running 4.0 and newer.