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You see this error message when activating your Trend Micro program on Windows:

"Too Many Installations.
You may only activate this software on a limited number of computers. Because you have reached that limit, you must either stop protecting another computer, or buy another subscription."

Why did this happen?

There are no available license seats left on your subscription.

What should I do next?

Depending on how you used up your subscription, you can either:

How do I prevent this from happening?

Log in to the Trend Micro Account portal to manage and check your active licenses.