It's not supported so if you have an issue, not much they can do.
However, you can manually install the plugin into your version and see if it works. I would strongly suggest doing so in a dev environment first in case something blows up.
Where to get the versions:https://marketplace.atlassian.com/plugins/jp.junoe.confluence.plugins.conf2dita/versions
Download the Jar file.
Here is how to manually install a plugin:
You can install most add-ons using the single-click installation method, as described in Finding new add-ons. Alternatively, you can install an add-on by uploading it to your Atlassian application. You must use this method to install add-ons that are not available on the Marketplace, such as a custom add-on you created, or if installing an older version of an add-on.
Add-ons are normally distributed as JAR or OBR (OSGi Bundle Repository) files. These are the only types of add-on distribution files that are accepted by the file upload mechanism.
Note that some add-ons are distributed as ZIP files or other types of files other than JARs. These are typically add-ons that run separately from the host application container, such as the JIRA Client. In Atlassian Marketplace, these entries have a Download button that you click to get the add-on.
If you attempt to install a file that isn't a JAR or OBR file in the 'Manage Add-ons' page, the following error appears:
Could not find a handler capable of installing the add-on at filename. Check that the file is a valid add-on.
You should refer to the installation instructions provided with the add-on in this case.
Before installing by file upload, make sure that the add-on distribution file that you want to upload is accessible to your computer either at a file system location or at a network location by URL.
To upload an add-on:
You can now manage the add-on from the user-installed add-on list on the Manage add-ons page.
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@Manon Soubies-Camy is an engineer who has been an avid Atlassian user since 2014. She helps companies of all sizes transform the way they work with the Atlassian stack, including Jira and Confl...
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