Thank you, this is similar but not the same.
The old extension provided that, after a certain number of the part of the same host access, (5 or 8, in Your Choice), every time that the guest visiting a post, came a message saying something like
Hello guest, we noticed that we've already visited 5 times, so we can assume that the topics covered on this forum are of your interest. If so, we'd like you too will become our user.
Register here (by clicking on these two words were directed to the registration page), so you will become part of users, and you can visit and participate in the topics that you like.
It would be very useful, because often the first topic is already very exhaustive, and guests could be content with just reading what, what's not fair to the other users.
Thanks anyway for your attention, a greeting and sorry again for my english