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IMPORTANT: You need to take note that the system key may change if the network interface changes, which will then require license reactivation.
View screen shot
2. In the pop-up window, look for the "System key". What you will need is the alphanumeric string, something like this "c55febb76336c13376c2697528090674". Copy the system key into your clipboard. Ensure that you only copied the string of alphanumeric text, no pre or trailing "spaces". See the following screen shot.
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