Acrosup64.dll — Is Not Marked For Installation
acrosup64.dll is not marked for installation — a tiny ghost in Program Files, an unused whisper. Windows lists it in a column of red, a filename like a forgotten prayer, its version number worn thin by updates that never called its name.
Standard uninstallation through the Control Panel often leaves behind traces that cause this error. Adobe provides a dedicated cleanup utility to wipe the system clean.
This error is generated by Windows Installer (MSIExec) when a custom action attempts to access a file that was not properly included or flagged for installation in the package. In simpler terms, the installer package expects a certain file to be present and registered, but the file either: acrosup64.dll is not marked for installation
Go up one level and check the Local and LocalLow folders; delete any folders there as well. 2. Registry Cleanup (Advanced) Press Win + R , type regedit , and hit Enter. Back up your registry first ( File > Export ).
This article provides a comprehensive guide to resolving this issue, ranging from simple cleaning tools to manual registry edits. What is acrosup64.dll? acrosup64
: Use 7-Zip or a command line to extract the .exe installer into a folder.
: This is the most successful solution. Download the Acrobat Cleaner Tool to completely remove all traces of Adobe products before attempting a fresh install. Manually Delete AppData : Uninstall Adobe via the Control Panel . Navigate to C:\Users\%userprofile%\AppData . Adobe provides a dedicated cleanup utility to wipe
Corrupted temporary installation files can misinform the Windows Installer service about which components are currently present. Press Windows Key + R to open the Run dialog box.
The Windows Installer is trying to perform an operation (e.g., uninstall, repair, or update) on the acrosup64.dll file, but the internal MSI database indicates that this file should NOT be installed in the current context.
Navigate to C:\Program Files\Adobe or C:\Program Files (x86)\Adobe and delete the Reader folder. Restart your computer. Solution 3: Re-register/Unregister the DLL (Manual Fix)
Did this happen during a or a manual installation ?
