After reading this post it made me nervous about installing Superchips downloader. I called CS. at Superchips they said even though mine was was new out of the box to go to the web site and download the updates. Did that, and it put in two new files. One appears to be the extreme program. Anyways I had to go over to the 5 Star ******* for a part and thought, this would be a great place to do the downloader the first time. I mean heck, if it screws up the program in the ECM, all they have to do is push it in the garage to reflash it. Anyway, it took about 8 min. to suck out the stock parameters and down load the performance tow program. All went well. The truck got a nice little kick down low and the motor sounds a little differerent, probably the timing. I'll keep all informed about gas milage and ect. Sorry about your experiance with the down loader hope all is well now.