Do not buy keys from eBay or G2A. These are often stolen credit card purchases that will be revoked.
You do not need a "license key" at all for these. They are freeware, open source, or donation-ware. Amp Free License Key
Case 1: "I downloaded a cracked Ampeg simulator. My PC got ransomware. I lost 3 years of song projects. I paid a specialist $500 to recover 30% of them. The software would have cost $149." Do not buy keys from eBay or G2A
Case 2: "I used a keygen for Guitar Rig. It worked for a week, then my antivirus flagged it. The crack corrupted my audio drivers. I had to reinstall Windows. Never again." If your search for an "Amp Free License
Case 3: "I was honest and bought AmpliTube 5 on Black Friday for $99. I have used it for 2 years without a single crash. I upgraded for free to version 5.5. Total value: priceless."
If your search for an "Amp Free License Key" is related to website building, you may have been misled by aggressive marketing from premium plugin developers.