Offline Update

You can use the offline-updater if you don't have direct access (or via proxy) to the internet from your server / workstation where pimcore is running. (Otherwise use the build-in "Live-Updater" directly in your pimcore installation [Extras->Update]).

Just select the build of your current pimcore version and then select the build you want to update to. 
After downloading extract the ZIP directly to your document-root (not to a subfolder, or new folder). Then open the following URL in your browser:

http://www.example.com/update-[BUILD_NUMBER]/ (replace BUILD_NUMBER with the build number you want to update to).

Now a wizard should appear, then just follow the wizard.