Acrosup64.dll Is Not Marked For Installation //free\\ Jun 2026

acrosup64.dll is often loaded by the print spooler or a system tray app.

IT administrators deploying Adobe Reader updates via SCCM often encounter this error across multiple machines. Based on community solutions, here's what works: acrosup64.dll is not marked for installation

Which specific (e.g., Acrobat Pro DC, Adobe Reader 2020) are you trying to install? What operating system version are you currently running? acrosup64

If you are comfortable with the Windows Registry, you can search for and delete specific product keys that are stuck. and navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\ Look for keys starting with What operating system version are you currently running

This solution is intended for system administrators and experienced users only.

Open File Explorer and navigate to the following paths. Note that "LocalLow" and "Roaming" folders are essential to check:

Press Windows Key + R , type %appdata% , and hit Enter. Delete the folder inside this directory.