The standard is a copyrighted publication and must be purchased or accessed through authorized platforms: Official API Webstore : The primary source to purchase the 21st Edition Accuris Standards Store
As a copyrighted publication, API Spec 6A is not available for free public distribution. The official PDF must be purchased from authorized distributors to ensure you have the complete, correct, and up-to-date version, including all amendments and errata.
The 21st Edition transitioned from a shared framework with ISO 10423 back to a standalone American Petroleum Institute Standard .
I should also consider that the user might not be aware of the proper channels. They might have encountered a website that hosts forbidden downloads or think that some free resources exist. I need to guide them towards legitimate options, like purchasing the document through the API's official site or through a company that provides such standards.