I placed the 'jira-calendar-plugin-4.0.3.jar' into the 'D:\Program Files\Atlassian\Application Data\JIRA\plugins\installed-plugins' directory on our QA JIRA server.
JIRA Version is 6.3.1
Is this a compatible version?
Also, how do access the calendar, how do you get there?
You should not be installing plugins like that on that version of JIRA. Use the UPM properly - it won't let you install invalid versions. If you can't use the UPM connection to the marketplace (firewall prevents external access is the usual reason), then use the "upload add-on" function in the UPM and select the correct version from the list of versions on the marketplace entry.
In this case, a glance at https://marketplace.atlassian.com/plugins/com.atlassian.jira.ext.calendar/versions will tell you exactly what's wrong.
Ah, I see. I'd assumed a long partial familiarity with JIRA because you were installing add-ons using an old deprecated method. Sorry!
The UPM is the "universal plugin manager" - it's an add-on distributed as part of most Atlassian applications and it adds some links to the admin section of all of them. The main things it adds are "search for new add-ons" and "manage add-ons", and then all the screens behind them. It does what it sounds like it does - provides the management of add-ons within the applications.
From JIRA 5 onwards, you should use it for almost all add-on installation and management. There are a couple that it can't handle, but even those it will tell you about!
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