I have the same problem! It is interrupted at 25%, sometimes at 30%.
Having the same problem. And I'm getting tired of chasing all over the internet to find a way to fix this problem.
This morning we resolved a problem that prevented Flash Player installations from completing for some of our Macintosh users.
If you encountered this problem, please delete any previously downloaded Flash Player installer and either:
- Download the installer again from https://get.adobe.com/flashplayer, OR
- Download the stand-alone installer posted at the bottom of the http://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-mac.html in the ‘Still having problems’ section.
Thanks, problem resolved