I found this didn't work because unrar couldn't locate the rar file. Suggest usage of: unrar x -r "%F"/*.rar "%F"/
Breakdown
Unrar x - r -> Unrar is installed so this calls unrar and -r works recursively and -x Extract files with full path.
"%F" -> download folder directory location for where files are. Did not work with other commands in ""
/*.rar -> look for the .rar file.
"%F"/ -> Where the files will be extracted, same directory.