Acrosup64.dll Is Not Marked For Installation

If you are reading this, you have likely just been stopped dead in your tracks by a dialog box that makes very little sense. You are trying to install a piece of software—perhaps a printer driver, a Lenovo system utility, or an audio interface driver—and Windows Setup has thrown a cryptic error:

"acrosup64.dll is not marked for installation."

You didn't ask to mark anything. You just wanted to install a program. So, what is going on?

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.

The phrase originates from Microsoft Windows Installer (MSI) technology. Every file that an MSI package manages has several attributes, including:

The error "acrosup64.dll is not marked for installation" means:

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.

In simpler terms: The installer has found a reference to the DLL but cannot reconcile it with the intended installation state. This usually happens due to:

Once you resolve "acrosup64.dll is not marked for installation," follow these best practices to avoid recurrence: acrosup64.dll is not marked for installation

Warning: This step involves editing the Windows Registry. Incorrect edits can cause system instability. Proceed with caution.

If the error persists, the specific registry key for the component might be corrupted. You can attempt to locate the component key, but this is often difficult as the keys are GUIDs (random strings of numbers). A more practical advanced step is to re-register the DLL manually, though this is a workaround rather than a full fix.

The “acrosup64.dll is not marked for installation” error is an MSI state inconsistency, not a missing file or disk error. Standard uninstall is insufficient. Adobe Cleaner Tool is the safest and fastest resolution. Manual registry editing is possible but risky for non-experts.

Estimated resolution time: 10–20 minutes using the cleaner tool.

The error message "Error 2753: The File 'acrosup64.dll' is not marked for installation" typically occurs when installing or updating Adobe Acrobat Adobe Reader

. It indicates that the Windows Installer has encountered a conflict with a specific DLL file, often due to corrupted registry keys or leftover files from a previous installation. Recommended Fixes 1. Use the Adobe Acrobat Cleaner Tool

This is the most common and effective solution. It removes all traces of previous installations that might be causing the "not marked for installation" conflict. Download the official Acrobat Cleaner Tool

Run the tool and select the product version you are trying to fix. If you are reading this, you have likely

Restart your computer and try installing the application again using an offline installer 2. Manually Clear AppData Folders

If the cleaner tool doesn't work, manual removal of cached files may be necessary: Uninstall Adobe via the Control Panel Navigate to C:\Users\%username%\AppData In each of the folders, find and delete the Restart your PC before re-attempting the installation. 3. Advanced Registry Cleanup (For Experienced Users)

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

(common for Adobe products) or any folder that mentions "Adobe" or "Acrobat" inside its registry values.

Back up your registry before deleting anything, as mistakes can cause system instability. 4. Repair Visual C++ Redistributables

Sometimes, missing or corrupted dependencies cause DLL errors. Adobe Help Center Control Panel > Programs and Features Microsoft Visual C++ Redistributable (specifically versions from 2013 onwards). Select each one and click Adobe Help Center Summary of Causes error the file acrosup64.dll is not marked for installation 4 Jan 2015 —

Technical Report: Error 2753 - acrosup64.dll is Not Marked for Installation 1. Executive Summary The error message "The file 'acrosup64.dll' is not marked for installation" (often accompanied by Error 2753

) typically occurs during the installation, uninstallation, or update of Adobe Acrobat or Adobe Reader. It indicates that the Windows Installer service encountered a script reference to a file that it believes should not be part of the current installation action, usually due to leftover files or corrupted registry entries from a previous version. JustAnswer 2. Technical Details File Identified acrosup64.dll (Acrobat 64-bit Installer Support). Common Scenarios The error "acrosup64

: Upgrading from older versions (e.g., Reader XI) to newer versions (e.g., Acrobat DC) or reinstalling after a system crash. Root Causes Registry Conflicts : Stale entries from failed uninstalls. Leftover Files : Physical files remaining in the C:\Program Files (x86)\Adobe directories that conflict with the new installer. Installer Corruption

: Corrupted Windows Installer service or installation packages. 3. Recommended Solutions

The following steps are ordered from the most common effective fix to more advanced system repairs. Step 1: Use the Adobe Acrobat Cleaner Tool

Adobe provides a specialized utility to remove all traces of previous installations that standard uninstallers might miss. Download the tool from the official Adobe Cleaner page

Run the tool, select the product version (Reader or Acrobat), and complete the cleanup. Restart the computer before attempting a fresh installation. Step 2: Manual Directory Cleanup

If the cleaner tool fails, manually remove remnant folders that might be causing the conflict. Program Files : Delete any Adobe-related folders in C:\Program Files (x86)\Adobe : Navigate to %USERPROFILE%\AppData and delete Adobe folders within the subfolders. Step 3: Re-register the Windows Installer Service

Resetting the installer service can resolve "not marked for installation" errors by refreshing its internal state. Adobe Help Center error the file acrosup64.dll is not marked for installation

Troubleshooting Guide: "acrosup64.dll is not marked for installation" Error