I am having the same problem as others, the updater fails to update the Extensions Manager. I am not installing it through MacCleaner or any other virus protection. I am just downloading the dmg and trying to get it to install. I get this message.
Updates could not be applied.
error log file
Extension Manager 6.0.8 Update
Installation failed. Error Code: U44M2P7
I guess the dmg file you download is the patch file. There was something wrong with you applied the patch. The possible reason is that some files in Extension Manager package file were changed or removed after installation, or the PCD information was corrupted. The simplest way to solve this issue is to delete Extension Manager CS6 installation folder manually, then download the 6.0.8 full installer from http://www.adobe.com/exchange/em_download/em6_download.html and install it.