Acrosup64.dll Is Not Marked For Installation May 2026

The error message "acrosup64.dll is not marked for installation" (often appearing with Error 2753 ) typically occurs when installing or updating Adobe Acrobat Adobe Reader

This error is a perfect example of modern computing's fragility: a single, tiny DLL file (Dynamic Link Library) standing between you and your software. This post will dissect why this happens, what this file actually does, and the specific, surgical steps to fix it without breaking your OS. acrosup64.dll is not marked for installation

Step 1: Terminate the Spooler & Locking Processes

acrosup64.dll is often loaded by the print spooler or a system tray app. The error message "acrosup64

  1. Download the Tool: Search for and download the "Acrobat Cleaner Tool" (AcroCleaner) from the official Adobe Labs website. Ensure you select the version appropriate for your software (Acrobat or Reader).
  2. Run the Tool: Close all Adobe programs and run the cleaner. It will scan for installed Adobe products.
  3. Select and Clean: Select the version of Acrobat or Reader causing the error and confirm the cleanup process.
  4. Reinstall: Once the tool finishes, restart your computer. Download the latest version of Adobe Acrobat/Reader from the Adobe website and perform a fresh installation.

Once complete, run the update file (.msp) inside the same folder to update the software to the latest build. Summary Troubleshooting Checklist Action Item Why it helps Adobe Cleaner Tool Safely removes corrupt installation profiles. Delete AppData Folders Cleans out bad cached files preventing the update. Third-Party Uninstaller Removes orphaned registry entries. Manual Extraction Bypasses faulty bootstrapper installers. Right-click on the Start button and select "Command

3. Clear Windows Installer Registry Entries via Revo Uninstaller

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