![]() However, if you have previously purchased Phoenix 360, your Phoenix 360 Activation Key will allow you to upgrade to System Mechanic Ultimate Defense. If you have installed System Mechanic Ultimate Defense (or Phoenix 360) and are attempting to use a System Mechanic or System Mechanic Professional key, the key will not work. If you have an earlier version of System Mechanic, such as System Mechanic 15, and are trying to activate with an Activation Key meant for System Mechanic 16 or greater, the key will not work. Copying and pasting the key into the product which can also copy blank spaces. ![]() Most common causes of activation keys not being accepted: It is best to use all upper-case so that there is no confusion. When activating iolo products, please make sure that you are using the correct product that they Activation Key is meant for and that you are typing the characters correctly, such as 0 (zero) versus O (oh) and the letter I (eye) versus l (L). Modified on: Wed, 3 Nov, 2021 at 12:18 PM Solution home Product Support Product Activation Error 2: Activation Key Not Recognized when trying to activate
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