BusyBox Pro is a paid version of the very famous and convenient http://www.androeed.ru/files/busybox.html>installer BusyBox.
Fastest and most reliable and installer BusyBox! Supports devices on ARM architecture and Intel-based. Mentioned in the XDA-Developers forum "XDA Developers' Android Hacker's Toolkit: The Complete Guide to Rooting, ROMs and Theming." Also, this utility won the "Best Software Utility for Android" award. Also, this is the only BusyBox installer, for which you do not need an Inteet connection.
After the download is complete, the downloaded file will be displayed in the notification shade (top), and will also be located in the "Download" folder (any file manager )
Install the downloaded APK file using any file manager or by clicking on it (on the downloaded file) in the notification shade
If you are installing apps for the first time not from Google Play (but using a file manager or browser), you will need to grant the appropriate permission. This is done only once.
If the file was downloaded with the bin extension, then there are 2 options:
Change the extension of the downloaded file to apk using any file manager ("rename" function)
To update the application, install the new version of the application over (without deleting) the old one.
This update will only be possible if the previous version of the application is downloaded from us. Otherwise, there will be a signature conflict and you will see the message "Application not installed".
For what "Signatures" are and what they are for, read here.