Uploaded stock tune, won't start!

This is my first post here and I have been reading alot and am very exciting about getting involved and learning to use this software.

On to my issue, I currently have a "wait4me" pcm tune I bought several years ago (hey it was a cheap pcm with a decentish tune). Well this morning I downloaded a stock tune for my vehicle from the bin repository, to save me the trouble of having to switch PCMs, and uploaded that to my pcm. The uploaded completes fine, but when I go to start the truck it will crank and crank but wont start. I was wanting to start from the stock tune because I want a blank slate to start from, plus I have the wait4me tune for comparison of something that works.

I didnt change the VIN of the downloaded tune to my own, should I?

Also, my Security light is on, even if I go back to the unchanged default tune that was on there.

I have a 2004 chevy silverado 5.3

thanks

Security light, not MIL, my mistake

EDIT:

Is the problem I need to do a VATS relearn since the file im trying to upload isnt native to my truck?

you should relearn vats