I believe you are talking about this plugin : https://marketplace.atlassian.com/plugins/com.atlassian.jira.plugin.ext.subversion.
I see that currently it is only supported till JIRA 5.2.11. However, there is an improvement request here : https://ecosystem.atlassian.net/browse/SVN-410 that tells us that the developers are currently working on a release for the new version of SVN plugin for JIRA 6.0.
I hope this helps!
The master branch was already fully compatible with the 6.x JIRA version a lot of weeks ago!. Hence, anyone can download the sources and build a 6.x compatible version in seconds. It will run without problems.
In fact, the latest changes (<24 hours) provide some code clean-up and a redundand compatibility with 6.x which already was implemented...
Or you might want to try this fork of the plug-in:
wihich is fully compatible, runs on JIRA 6.x and provides several improvements.
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