In the universal plugin manager it says this:
The Content Formatting plugin is free to use and does not require a license. Optionally upgrade to the Premium version by clicking the 'Buy Now' button and gain access to a range of macros that let you add rich Atlassian Design Guidelines compliant elements to your wiki pages.
Taking the plugin manager's language on it's face, we upgraded (via the 'upgrade' button, not the 'buy' button) to v. 4.2.19 expecting that the plugin would continue to work (Confluence v 5.8.17). Now it doesn't work and displays an error message saying it requires a license. The link in the error message is http://www.adaptavist.com/display/Plugins/Plugin+Pack+FAQ, which generates an error message saying 'London, we have a problem'
Indeed.
On the Adaptavist site, it's listed under 'Premium Add Ons', not 'Free Add Ons'.
I am utterly confused. Please advise.