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# Kibana Plugin overview
ReadonlyREST plugin for Kibana is not open source, and it's offered as part of the [ReadonlyREST PRO](https://readonlyrest.com/pro.html) and [ReadonlyREST ENTERPRISE](https://readonlyrest.com/enterprise.html) packages.
See product descriptions and a comparison chart in the official [ReadonlyREST website](https://readonlyrest.com)
ReadonlyREST plugins for Kibana **always require** ReadonlyREST Free to be installed in the Elasticsearch nodes your Kibana instance(s) will connect to.
It's not mandatory to install ReadonlyREST Free in all Elasticsearch nodes, but only in the ones in where you need the HTTP interface to be secured.
## After purchasing
You will receive a link to the plugin zip file in an email. Download your zip.
You will be able to download it also in the future as long as your subscription is active.
## Version strings
All our plugins include in their file name a version string. For example the file `readonlyrest-1.16.26_es6.4.0.zip` has a version string `1.16.26_es6.4.0`.
### Reading version strings