If you can't open the file because you don't have the right software, follow these steps based on your device:
: Open the Google Play Store and search for "RAR" by RARLAB. INSTALL.rar
: Go to the official WinRAR website and download the version for your system (usually 64-bit). If you can't open the file because you
: Double-click that file to begin the actual software installation process. 2. How to Install RAR Software (to open .rar files) INSTALL.rar
Whether you're looking to install a program contained within an file or you need to install the RAR app itself to open such files, 1. How to "Install" an INSTALL.rar File