Please upgrade your SiteSupra v3.0 License Keys to v3.1 by logging onto SiteSupra.com, My Licenses page, and copy/paste the updated keys into your SiteSupra 3.0 and 3.1 installations. That will allow you to download and use SiteSupra Plugins.

Also, if you haven't done it yet, please upgrade your SiteSupra 3.0 installations by downloading the latest SiteSupra v3.1.20 archive from the Downloads and overwrite the SiteSupra files with the new ones. The build resolves a numbers of issues, including security holes found in v3.0.