Once plesk License Key expired plesk panel will show below error screenshot

Follow the below steps to install the free plesk License Key in your plesk panel

Step 1 : Open the below URL 

              https://www.plesk.com/plesk-free-download/

Step 2 : Fill out the form

Step3:  Once submitted the step 2 form after that You will get the confirmation email to your registered email id for verification.

Step 4 : Once verification done you will get below Plesk License Key

Step 5: Check the Windows Server Login details and from the details login to the Plesk Panel.

Check below plesk panel URL :

http://your-server-IP-addrress:8880/

Step 6 : Click on Install Key option in plesk panel

Step 7 : Copy the Plesk License Key and paste in the plesk panel