If you're facing any issues related to the installation please try the following:
- If you've installed the plugin manually make sure you're using the correct app version - DC or Server
https://marketplace.atlassian.com/manage/plugins/io.extensi.jira.plugin.agileboardfilter/versions
Uninstall the plugin and reinstall it again - Contact us at support@extensi.atlassian.net
The following message indicate that Jira Software Application and Jira Agile Plugin are disabled