Hi .. I have a Mac desktop snow leopard OS X 10.6.8; When attempting to play quick time movies (e.g. img_2522.mov; DSCNO525.mov) I get msg "add'l software required; when I click link to check for the software I get "page not found". I have previously been able to play QT movies with no problem. I have Quick Time Player 7; firefox browser Vs. 48.0.2. Any suggestions for help in playing my movies would be appreciated. Thank you.