Using unauthorized codes violates the terms of service and deprives developers of the resources needed to maintain the tool. How to Get a Valid Airy Activation Code
If you are not ready to pay for an activation code, you might consider free alternatives, though they come with their own trade-offs: airy youtube downloader activation code
If you prefer not to pay for a downloader, there are safe, open-source, or free alternatives that do not require activation codes: Using unauthorized codes violates the terms of service