Acrosup64.dll Is Not Marked For Installation -
The Frustrating Error
Run the Adobe Cleaner Tool
The community consensus is that standard uninstalling isn't enough; you must wipe the "ghost" files first. : Download and run the Acrobat Cleaner Tool.
Backup your registry first
Press Win + R , type regedit . (File → Export). acrosup64.dll is not marked for installation
2. Root Cause
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: The Frustrating Error Run the Adobe Cleaner Tool
Executive Summary
(Acrobat 64-bit Installer Support file) may be orphaned in the system folders, causing the installer to fail when trying to "mark" it for a fresh setup. Damaged Local Files : Corrupted files in the Program Files (File → Export)
Expected Result:
acrosup64.dll should be installed to the product folder as part of the core Acrobat installation.