If your prefer installing the plugin manually, the latest version can be downloaded here. Upload it through the Atlassian Universal Plugin Manager in the Jira Administration section: Administration → Manage apps → Upload app.

To enable Jira to upload and install a .jar file, please make sure to use the correct JVM flag.

Here is the referring documentation: https://confluence.atlassian.com/jirakb/how-to-re-enable-plugin-upload-1364557898.html

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