On MBPro OSX Mavericks using Safari browser; was requested to upgrade to newest Flash and attempted. Got through download and quit browser. Installation begun and then stopped. Several times. Said app could not be installed.
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:
If the behaviour reproduces, please clear the browser's cache and try downloading again.