I cannot find the plug-in in the marketplace (I use Confluence server 5.8.4) and I did not understand if it is free or not... on vendor web-site it says it is free, but in the marketplace it gives a price...
It is free, but it consists of a paid component. As long as you don't run the click the free trial or buy buttons, you can use the free functions (which is most of them except for things like tabs). Even if you do do the free trial, the rest of the functions will stay free after the trial period, but you won't be able to access the paid functions anymore.
maybe, it's not be listed as compatible (only up to 5.7.4). In that case, you could just download the jar (the download link towards the bottom of the page) and install it manually and make sure there's no issues (I highly doubt it, most of them are simple HTML/CSS stuff)
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