Updating os x 10 2
Being the Combo updater, this should fully update all versions of OS X Yosemite prior to 10.10.2; however, before using it, be sure you have a full and restorable backup of your system that you can restore to if a problem arises.
Mac OS X 10.8.1 update is recommended for all users running Mac OS X 10.8 Mountain Lion.
It includes general operating system fixes that smooth out some bugs and also seems to fix a common issue where battery life was not displaying correctly for some users.
If you are finding this problem, first be sure you have attempted updating from the App Store, then by downloading the Delta updater (for 10.10.1 users), and then attempt to download and apply the Combo updater.
This last updater should be able to update any version of OS X from the first to the last; however, if none of these work for you, then you can still force the 10.10.2 installation to proceed with the Combo updater you downloaded.