You can use this plugin : https://marketplace.atlassian.com/plugins/com.atlassian.jira.plugins.jira-importers-plugin/versions
just download the version that's compatible with your Jira instance.
[Note: So it was my turn for Friday Fun and sadly I was sick thanks to rubbish sinus infection... so apologies to most of Europe and Asia for the delayed post. However, I finally got out of bed for t...
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