I'm sorry, I must be missing something obvious...the instructions on how to install the plugin are about how to install the Contact Form 7 plugin itself, not this Dynamic Text Extension addition to it. Where do I put wpcf7_dynamic_text.php, which is in this downloadable file? I tried putting it in its own directory in the plugins folder, but it doesn't appear in the list of inactive plugins. I tried putting it in the contact-form-7 plugin folder, and in the modules sub directory within that, but I still don't get a "Dynamic Text" option under my list of tags.
What am I missing?