Combining PDF

Thanks. This is indeed an add-on for Reader. I may be wrong, but it might not work with old versions of Reader like XI. But you should also check your account details on http://www.adobe.com/ which will let you check if the subscription is still valid.

There are three different paid products that can combine PDFs. It may be helpful to be sure which one you used to use.  Can you tell us, as close as you can remember, whT you did (clicked, chose) to combine PDFs.