- Log into your JIRA instance as an admin.
- Click the admin dropdown and choose Add-ons. The Manage add-ons screen loads.
- Click Find new add-ons from the left-hand side of the page.
- Locate gears-desk via search. Results include add-on versions compatible with your JIRA instance.
- Click Install to download and install your add-on.
- You're all set! Click Close in the Installed and ready to go dialog.
So,you can download from below link: