Installation
Automated: Apps in Marketplace
Open Administration drop down menu
Click on Add-ons/Apps
Find new add-ons/apps
Search for "UnView for Jira"
Manual: https://confluence.atlassian.com/display/UPM/Installing+add-ons
Upgrade
You've got a valid license? Hooray!
Open Administration drop down menu
Click on Add-ons
Manage add-ons
Search for UnView for Jira
If Update is displayed press it
License
UnView for Jira licenses can be purchased through the Atlassian Marketplace.
After you bought your license follow following steps to apply:
Open Administration drop down menu
Click on Add-ons
Manage add-ons
Search for UnView for Jira
Click on add-on entry
Copy-and-paste the license key into the license box and press update
Optional: Get cake!
For further information see here: https://confluence.atlassian.com/display/jirakb/How+to+Update+Your+Add-on+License