Ok thanks and how do I load it to my truck ? Do I need to return my truck back to stock then load the rkl tunes or what ?

how do I get the rkl file open to download it ? I click on it and it opens in adobe reader and says cannot open. what do I need to do to get the fie open so I can download it to my tuner ...any help is great thanks

can somebody walk me threw downloading the rkl tune off the first page of this thread to my computer then to my tuner ? im not real good with computers ...I click on the rkl file on the page and click open but it comes up on adobe reader and says cannot open ?? what do I need to do ? thanks