OpenTG is open-source software. There is not a commercially supported option available. If you have run into trouble with the software, there are a few options to get help:
Often a work-in-progress, documentation and information is available on this Wiki. Click on the “Sitemap” link to view a list of all available topics and articles.
Developers and community members may be available in the IRC channel. The official channel is #telegard on FreeNode.