The interface of the program to use the files using unrarx and command us as you do not have an application for Mac developed by cocoa allows you to open RAR files.
You will need to just double-click the RAR file and Finder will open it. File is on the Preferences menu, the options such as enabled or all the petitions process gives you permission to accept the sub without asking.
Using Par2 and RAR file in UnRarX can fix if any errors are found, you can check the integrity of each item.
In short, thanks to unrarx RAR files will no longer be a problem.