I'm trying to re-download Adobe Acrobat 9 Pro to my Mac but it keeps stalling on the installer screen. I don't get as far as the lisence key. Have tried from the original installation DVD as well as downloaded the installer from the Adobe website but

I'm trying to re-download Adobe Acrobat 9 Pro to my Mac but it keeps stalling on the installer screen. I don't get as far as the lisence key. Have tried from the original installation DVD as well as downloaded the installer from the Adobe website but it remains the same when I try to install