Seems that the latest version of JIRA that is supported by Bulk Clone is JIRA 5.0.7, as mentioned here : https://marketplace.atlassian.com/plugins/com.netent.jira.plugins.bulkclone.BulkClone/version/5
I wouldn't recommend forcibly trying to install the plugin into JIRA 5.2, as it might cause some damage to your instance, and cause it to not work properly.
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