Summary

With JIRA Vanilla versions 7.3 and 7.4 bundled plugin JIRA iCalendar plugin is installed. But if you click on it you will see message: "This add-on is not compatible with your JIRA instance. Request an update from the vendor."

On the marketplace i can see that plugin is incompatible with current versions 7.3 and 7.4
https://marketplace.atlassian.com/plugins/com.atlassian.jira.extra.jira-ical-feed/versions

1.4.7 - JIRA Server 7.0.0 - 7.2.10 -  2015-10-20  Bug fix release for JIRA 7

Steps to Reproduce

1. Install Jira 7.3 or 7.4
2. Locate system add-on IRA iCalendar plugin
3. Expand the view for that plugin

Expected Results

1. No error/information message is displayed

Actual Results

1. Error/information message will be displayed "This add-on is not compatible with your JIRA instance. Request an update from the vendor."

Workaround

No workaround at the moment.