Ensure your installer matches your key exactly. A FineReader 11 Corporate Edition key will not activate FineReader 11 Professional Edition.
If you want to find the best tool for your workflow, tell me: What is your (Windows, macOS, etc.)? How many pages per month do you need to process?
Here are some general steps you might follow for activation:
Do you need like batch processing or multi-language support?
This code is tied directly to your computer's hardware configuration.
The Difference Between a Serial Number and an Activation Code