[German] Adobe is phasing out support for its two products Adobe Acrobat 2015 and Adobe Reader 2015 within a few months. This is stated in a company announcement.
Adobe is offering five years of product support from the general availability date of Adobe Acrobat and Adobe Reader. This means that support for products released in 2015 will expire in 2020.
In this release note, Adobe notifies that it will no longer provide product and technical support for Adobe Acrobat 2015 and Adobe Reader 2015 from April 7, 2020. End of support means that Adobe will no longer provide technical support, product and/or security updates for all derivatives of a product or product version (e.g., localized versions, minor upgrades, operating systems, point and colon versions, and connector products).
Users will still be able to use Acrobat 2015 and Reader 2015. But there are no more updates from Adobe for bugs or vulnerabilities. The manufacturer recommends upgrading to the latest versions of Adobe Acrobat DC and Adobe Acrobat Reader DC. (via)