If your system is Snow Leopard or any previous version you can use the official CD/DVD discs. If you are running Lion, you can purchase an official Mac OS X Lion Thumb key. download from the App Store the OS X base installer application:įor Mountain Lion or Lion do not download the official image from the Mac App Store because it will already include the updates that you probably want to avoid.

To be able to install the base version of the system you have to: Mind that it will restore Apple default permissions on OS X system files, overwriting any customised permission that you may have set for other subsitems like homebrew, ruby, MacPorts etc. It’s NOT considered a dangerous operation, it is even recommended by Apple as a troubleshooting technique. Without wiping the the current installed system. Re-installing a previous release ( of the same OS X version) on an existing system will overwrite the most recent system updates that you may have applied so far. You can dowload the dmg archives of any minor release on Apple Support page:

After that you will apply your favourite minor release. To revert to a previous minor release of OS X you MUST first re-install the base major release of the specific OS X version (in our case OS X 10.8) over the current installed system volume.

Downgrade teamviewer 9 to 8