A .rar file is a compressed folder, like a digital suitcase. You cannot "run" it directly; you must first unpack it.
: Double-click that file to begin the actual software installation process. 2. How to Install RAR Software (to open .rar files)
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.
: Run the downloaded .exe file. Follow the prompts and click Install .
: Go to the official WinRAR website and download the version for your system (usually 64-bit).
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