Michael,
you are rigth it is not a PA, I didn't find a way to install a provider as a PA.
Here the description of the download, it include a short installation description:
The ZIP file of this download contains an advanced version of FTB HtmlProvider.for DNN 3.0.13. The advanced Provider contains now an additional button to insert formatted source code in the text. For using this advanced version you must unzip the files in the root folder of your dotnetnuke application, or you unzip the files to a seperate folder an copy then the extracted files to the related folder of your dotnetnuke application.
This download contains now the actual dll file of ftb control 3.0.5000.3
HTH