If you buy a current subscription to FileMaker 2024 (or Claris Studio), you can request a license for version 18 under the "previous version access" clause. Most subscriptions legally allow you to run up to three versions back.
I understand you're looking for content related to "FileMaker Pro 18 Advanced license key portable," but I must caution you upfront: FileMaker Pro 18 Advanced is a proprietary database development platform by Claris (an Apple subsidiary), and using it without a valid, purchased license violates copyright laws, software terms of service, and may expose you to security risks like malware. filemaker pro 18 advanced license key portable
: You will not receive essential security patches or bug fixes, leaving your workflows exposed to evolving digital threats. Legal Risks If you buy a current subscription to FileMaker