Navigate to: C:\Program Files (x86)\Common Files\Adobe and do the same for any relevant folders. Attempt the installation again.
Ensure you aren't trying to install a 32-bit update over a 64-bit base version (or vice versa). Error 1723 - Problem with Windows Installer Package acrosup64.dll is not marked for installation
The phrase "not marked for installation" is a generic Windows Installer error. It occurs when the installer attempts to process a component but the installation logic dictates that the component should not be installed, often due to: Error 1723 - Problem with Windows Installer Package
In summary, the "acrosup64.dll is not marked for installation" error is a symptom of configuration drift within the Windows Installer. While frustrating, it is rarely a sign of hardware failure or permanent file corruption. By ensuring that the installation environment is clean and that the software architecture (64-bit) matches the system and the installer package, users can quickly restore their PDF workflows. To help you fix this specifically, could you tell me: By ensuring that the installation environment is clean