Modern versions of FontCreator use a registration system tied to your specific machine hardware. A generic code copied from a forum rarely works because it hasn't been validated against High-Logic's activation servers.
Version 14.0 introduced significant updates that made it a must-have for type designers:
If you are a hobbyist or student, you don't need the "Professional" license. The is significantly cheaper and provides almost all the core glyph-editing tools required to make high-quality fonts for personal use. 3. Legacy Upgrades
High-Logic offers a generous trial period. Unlike other software that limits your "Export" capabilities, the FontCreator trial allows you to test the full breadth of the professional features. This is often enough time to complete a single project. 2. The Home Edition Discount