Each product comes with a 15 day trial license.

After the license file is mailed to you, copy it into the /usr/local/zero directory (assuming that you have installed the trial version already -- if not, install it first; then copy the license file).

The commercial licenses are good for one year from the time of the purchase. You may install any available updates for the lifetime of the license.

Please note that commercial license files do not work with the free version, and viceversa, a free license will not work with the commercial versions of the respective products.