If you have purchased a paid plan for Auto Refresh, the license key unlocks the premium features inside the same extension popup — there is no separate installation step. The flow runs entirely inside the popup and takes three clicks plus a paste.
Open the Auto Refresh popup from the browser toolbar. At the bottom-right of the popup, click the orange Upgrade Plan button.

Your current auto refresh time:
10 Minute
A small "Upgrade to premium" dialog opens over the popup with two choices: Enter subscription key for an existing license, or Buy subscription to purchase one. Click Enter subscription key.

Your current auto refresh time:
10 Minute
Upgrade to premium
The dialog switches to a single text field. Paste
your license key in the format XXXXXXX-XXXX-XXXX-XXXX-XXXXXXX and click Save.

Your current auto refresh time:
10 Minute
Upgrade to premium
Enter subscription key
Once the key is verified, the popup reflects the upgraded plan and any premium-only options become available immediately. No browser restart is required.
XXXXXXX-XXXX-XXXX-XXXX-XXXXXXX
pattern. Make sure you copied the entire string with no leading or trailing spaces.