Once you have your key (a string of characters or a .zip file), follow these steps to activate it: Try Plesk Now - Plesk Documentation
A Plesk trial key provides full access to the control panel's features for a limited evaluation period, typically . How to Obtain a Trial Key plesk trial key
If you have received a trial key string (alphanumeric code) or a key file, follow these steps to activate it: Once you have your key (a string of characters or a