If your confluence version is prior to 5.6 version then you will need to explicitly install the 11.1 version. Here is the link to download.
https://marketplace.atlassian.com/plugins/com.atlassian.confluence.plugins.confluence-roadmap-plugin/versions
and about the cost it is free.
Pilar
Hi OksanaKos,
As per blog Existing Confluence Cloud customers already got this add-on, go to macro browser and search for Confluence Road Map.
http://blogs.atlassian.com/2015/01/roadmap-planner-macro/
Taha
In other words, it's free
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