Installing MLCS Plugin from .jar file (Data Center)

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: How to re-enable plugin upload in Jira Data Center | Jira and Jira Service Management | Atlassian Support