Jira's Redmine Plugin Not found

[nirby1]

Using JIRA Agile v8.6.1, but cannot find the redmine importer under:

Manage apps -> search the marketplace.

Follow this - https://confluence.atlassian.com/adminjiraserver079/importing-data-from-redmine-950288888.html

[nirby1]

Used #5 in - https://community.atlassian.com/t5/Jira-questions/JIRA-Redmine-Importer-Plugin/qaq-p/885470

but got: "We no longer support this plugin. To migrate your data, import it to Jira in the CSV or JSON file format."