This is the secret that most "free key" searchers miss. Plesk does not sell directly to end-users as much as they used to. They sell to (like DigitalOcean, AWS, Hetzner, GoDaddy, or Linode).
If you need to test all features (unlimited domains, Git integration, Node.js support, etc.), Plesk provides a 14-day trial license. free plesk license key free
: Check your inbox for a confirmation email. You must click the verification link to receive your actual license key. This is the secret that most "free key" searchers miss