Do I need to upgrade from Mavericks GM Although the GM should be identical to the final version, I am concerned about not being able to log into my computer in the future because of an expired developer/trial period.

The App Store normally shows a disabled button for installed apps which also will get future upgrades. However Mavericks shows with the "Download" button.

Should I go through a Mavericks reinstall?
Yes, you should install the final release of Mavericks.

The seed of Mac OS X 10.9 GM, Mavericks, is different to the edition available through the Mac App Store.


The seed had build 13A598.
The final release is build 13A603.


This suggests bugs were found and fixed since the final preview release. We have had reports of behaviour changes between the two versions.