PRO customers receive the following:
- Requests are given a top priority over any other requests.
- In depth troubleshooting.
- In depth guidance.
- Styling and site integration instruction and assistance.
- Plugin extending/filtering assistance.
- Site assistance.
The best way to get support for free plugins is to create a thread on the wordpress.org forum for the matching plugin. Support requests for free plugins are typically answered within 1 week. Free support includes basic bug fixing. The level of support may vary depending on availability.
Here are links to the wordpress.org forum:
If you are a free plugin user and would like priority support, you may purchase it anytime.