Using unauthorized keys violates Plesk’s Terms of Service and can lead to your IP being blacklisted.
The most common way to use Plesk for free is to sign up with a web host that (formerly Plesk Plus) at no extra charge. plesk free licence key
The most straightforward way to get a free license key is through the official . What you get: Access to all features for 14 days . Using unauthorized keys violates Plesk’s Terms of Service
– Plesk provides a 14-day trial with full features if you need short-term evaluation. plesk free licence key
Developers can sometimes access a "Developer Edition" license, which is often limited to a very small number of domains (usually 1-3).
Your time is worth more than the $8.50. Build something real instead.