If no how to proceed to activate again ?
When you get that message, it means you have exceeded all 6 your activations, and less than 90 days have passed since the last activation. You went into this situation, because you probably never used the "Deactivate" function of the Addon Manager, which allows you to reactivate on a new hardware or a new Windows installation without consuming an activation.
In your case, your only option is to contact us by email, so we can add an additional activation to your order.