There are lots of programs that allow you to do .rar recovery. If you still want to use the program, I can say that this is one of the best RAR Recovery Toolbox. You can use the demo version and test this program on efficiency. http://www.oemailrecovery.com/rar_recovery.html
Generally speaking , it’s much better to re-download the file. If that doesn’t work
You can try this:
1)Open the WinRAR application. Click on “File” and then “Open Archive” and browse to the damaged RAR file.
2)Press “Alt” + “R” on your keyboard. This will bring up the WinRAR repair dialog...