Adobe no longer sells directly, and official support for this version—including all security updates and technical assistance—ended on June 6, 2022 . While you may still find leftover physical stock or digital keys through third-party retailers, Adobe strongly recommends moving to their subscription-based models for continued security and modern features. Buying Adobe Acrobat 2017: What You Need to Know
If you are specifically looking for the 2017 version, here is the current market situation: Acrobat Classic 2017 - Adobe Community