I just checked the issue tracker for the plugin and it seems that the current version of the plugin, (v2.3), is compatible with Confluence 5.3.x and the Marketplace listing has been updated to reflect this: https://marketplace.atlassian.com/plugins/com.atlassian.confluence.plugin.copyspace/versions
All the best,
Hello! My name is Genevieve Blanch, and I'm the Marketing Manager at RefinedWiki, creators of apps to give teams the tools to customize Atlassian platforms. Currently, 44% of the tech team at Re...
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