I do not understand this new separation
For JIRA 6 and below, you need JIRA + Agile add-on + Service Desk add-on. You download JIRA and install the add-ons from the UPM.
For 7+, you need JIRA Core + Software application + Service Desk application.
You can download JIRA Core and add them both. Or you can download JIRA Software and add Service Desk. Or you can download JIRA Service Desk and add Software.
I recommend the middle one, especially if you are upgrading. Install JIRA Software and add the Service Desk application to it.
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