I have several questions about meaning of the number
Each add-on's "Active Installations" chart page (restricted to vendor contacts) has additional information:
In regards to instances behind a firewall, only those instance which are connected to the Marketplace are included in this count.
It's the number of upm's that has reported in during the week with the add ons that they're using. The type of license doesn't matter (Evaluation is an active installation). If somebody removes the add-on, the number should drop the next week. (Or at least that's my understanding)
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