I never heard of it being altered. If it was, what did they alter it to? It’s only a few seconds long, and other than seeing JFKs head exploding, does not have much detail. Keep in mind, it only 8mm taken from over 100 feet away.
I looked this up on the Zapruder film. This guy discusses the “altering”BS and considers it just that. More BS. But there are plenty of suckers out there who will buy most anything..
So you would have no problem having the original film inspected using today’s technology to put this argument to rest. If, as you imply, there is nothing to hide, this should be easy to confirm. An unaltered Zapruder film would quiet many speculations about government participation in the assassination. A Zapruder film that has been altered would confirm government participation. You’ve already admitted that you think we have been lied to by our government concerning this subject. How far do those lies stretch? Many of us want to know. Don’t you?