It looks like you’re referencing a specific version string for (2021.011.20039, 64-bit, multilingual).
This release includes several refinements and core functionalities that define the experience: Adobe Acrobat Pro DC 2021.011.20039 -x64- Multi...
Adobe no longer sells perpetual licenses for Acrobat Pro DC. As of 2023, only (monthly or annual) are available via Adobe.com. These automatically download the latest version (2023 or 2024), not 2021.011.20039. It looks like you’re referencing a specific version