1. Log into your Jira instance as a user with Jira administrator rank.
   
   
2. Click the admin drop-down (cog icon on the the right-upper corner of the screen) and select Add-Ons.
   
   
   
3. Click Find new add-ons from the left-hand side of the page.
   
   
   
4. Locate Issue Links Viewer via "search the marketplace" field - please note that its Vendor is Transition Technologies PSC.
   
   
   
5. Click Try free to begin a new trial or Buy now to purchase new license for Issue Links Viewer
   
   
6. Enter your information and click Generate license when redirected to MyAtlassian
   
   
7. Click Apply license