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The error "acrosup64.dll is not marked for installation" is a technical glitch typically encountered by users of Adobe Acrobat or Adobe Reader. This error usually surfaces during an update, repair, or reinstallation process of the software on 64-bit Windows operating systems. At its core, the message indicates a conflict in the Windows Installer database, where a specific component—the 64-bit Adobe Support Library—is recognized by the system but is flagged as "not to be installed," preventing the software from completing its setup or functioning correctly.
Understanding the cause of this error requires a look at how Windows manages software installations. When you install a program like Adobe Acrobat, the Windows Installer uses a database of instructions to determine which files go where. The "not marked for installation" flag occurs when there is a mismatch between the version of the software already on the disk and the update being applied. This often happens if a previous installation was interrupted, if there are leftover registry keys from an older version, or if the user is attempting to install a 32-bit patch over a 64-bit core application.
The primary impact of this error is the total or partial failure of the Adobe application. Users may find that they cannot open PDF files, or that specific features—such as the browser integration or the PDF printer—cease to function. Because acrosup64.dll is a support library, its absence or improper registration breaks the chain of dependencies the software relies on to interact with the Windows shell.
Resolving this issue generally involves a "clean slate" approach. The most effective solution is to completely remove the existing Adobe installation using the Adobe Creative Cloud Cleaner Tool or the Acrobat Cleaner Tool. Standard uninstallation through the Windows Control Panel often leaves behind the very registry entries that cause the "not marked for installation" conflict. By using a specialized cleaner tool, users can wipe the installer database clean. Once the system is scrubbed of these legacy markers, a fresh installation of the latest 64-bit version of the software usually proceeds without incident.
In summary, the "acrosup64.dll is not marked for installation" error is a symptom of configuration drift within the Windows Installer. While frustrating, it is rarely a sign of hardware failure or permanent file corruption. By ensuring that the installation environment is clean and that the software architecture (64-bit) matches the system and the installer package, users can quickly restore their PDF workflows. To help you fix this specifically, could you tell me:
Which version of Adobe are you using (Pro, Standard, or the free Reader)?
Did this happen during a Windows update or a manual installation?
Have you already tried using the Adobe Acrobat Cleaner Tool?
I can provide step-by-step instructions for the specific fix that fits your situation.
How to Fix the "acrosup64.dll is not marked for installation" Error
If you are trying to install or update Adobe Acrobat or Reader and hit the error message "File 'acrosup64.dll' is not marked for installation," you aren't alone. This is a common Windows Installer (MSI) glitch that usually pops up when there’s a conflict between an existing installation and a new update.
Here is a straightforward guide to getting your software back up and running. What Causes This Error?
The error typically occurs because the Windows Installer service thinks the acrosup64.dll file (a core component for 64-bit Adobe support) already exists in a state that shouldn't be overwritten, or the registry keys from a previous version are "ghosting" the new install. Step 1: Use the Adobe Acrobat Cleaner Tool
The most effective way to fix this is to completely wipe the slate clean. Standard uninstalls often leave behind the very registry keys causing the conflict. acrosup64.dll is not marked for installation
Download the Adobe Acrobat Cleaner Tool from the official Adobe website. Run the tool and select your product (Acrobat or Reader). Click Cleanup Now.
Restart your computer. This step is vital to clear the system cache. Try a fresh installation of the software. Step 2: Manually Rename the Adobe Folders
If the cleaner tool doesn't work, manual intervention might be needed to "hide" old files from the installer.
Close all Adobe processes via Task Manager (Ctrl+Shift+Esc). Navigate to: C:\Program Files\Adobe
If you see a folder named Acrobat, rename it to Acrobat_Old.
Navigate to: C:\Program Files (x86)\Common Files\Adobe and do the same for any relevant folders. Attempt the installation again.
Step 3: Run the Program Install and Uninstall Troubleshooter
Microsoft provides a specific tool for when programs won't install due to corrupted registry keys.
Download the Microsoft Program Install and Uninstall Troubleshooter. Run it and select Installing.
Look for Acrobat or Reader in the list. If it’s not there, select "Not Listed."
Let the tool repair the registry patches and try your installation once more. Step 4: Check for Windows Updates
Sometimes the Windows Installer service itself is out of date, leading to "not marked for installation" errors across various software. Go to Settings > Update & Security > Windows Update. Click Check for updates. Install any pending updates and restart. Final Pro-Tip: The "Direct Download" Method
If you are getting this error while using the Adobe Creative Cloud desktop app, try downloading the standalone offline installer from the Adobe website instead. These installers are often more "forceful" and can bypass the minor MSI conflicts that trigger the acrosup64.dll error. The error "acrosup64
The error "acrosup64.dll is not marked for installation" (often labeled as Error 2753) typically happens because of corrupted leftovers from a previous Adobe installation or a conflict between 32-bit and 64-bit components. The Most Effective Fix: Full Clean & Manual Install
The community consensus is that standard uninstalling isn't enough; you must wipe the "ghost" files first. Run the Adobe Cleaner Tool: Download and run the Acrobat Cleaner Tool.
Select "Reader" or "Acrobat" (whichever you're trying to fix) and let it remove all registry keys and temp files. Manually Delete AppData Folders:
Press Win + R, type %LocalAppData%, and delete the Adobe folder. Do the same for %AppData% (Roaming) and %ProgramData%. Use an Offline Installer:
Instead of the standard web installer, use the Adobe Reader Enterprise/Offline Installer.
Pro Tip: If the installer still fails, use a tool like 7-Zip to extract the .exe files and manually run the AcroRead.msi found inside. Advanced Workarounds If the steps above don't work, try these "deep" fixes:
Extract and Patch: If you are deploying via GPO or SCCM, manually extract the MSI and the MSP (patch) file into a new folder. Use the command line msiexec /a [path_to_msi] /p [path_to_msp] to administrative-install the patched version into a flat folder before running the final setup.
Disable the Update Service: If the error pops up during daily use (not just installation), go to Services.msc, find "Adobe Acrobat Update Service," and set it to Disabled to stop the broken update loop.
Registry Check: Ensure there are no lingering keys for older versions (like Acrobat XI) under HKEY_LOCAL_MACHINE\SOFTWARE\Adobe.
Are you trying to do a fresh personal install, or are you deploying this across a network using SCCM? error the file acrosup64.dll is not marked for installation
Here’s a technical write-up for the error “acrosup64.dll is not marked for installation”.
Level 1: Basic Repair (Success Rate: Low) Running the standard "Repair" utility from the Control Panel often fails because the installer hits the same logic error. However, it is the recommended first step.
Level 2: Adobe Cleanup Tool (Success Rate: High) Adobe provides a specific tool designed to resolve this exact registry state conflict. Remediation Strategy Level 1: Basic Repair (Success Rate:
Level 3: Microsoft Program Install and Uninstall Troubleshooter (Success Rate: Medium)
acrosup64.dll is not marked for installation when it actually needs to be.Level 4: Manual Registry Edit (Advanced)
You will likely see this error in the following situations:
The error message "acrosup64.dll is not marked for installation" is a common Windows Installer (MSI) failure typically associated with Adobe Acrobat or Adobe Reader. This error suggests a state mismatch between the Windows Registry and the actual file system, where the installer believes a patch or component is already present or improperly configured, preventing the installation, update, or uninstallation from proceeding.
Once you resolve "acrosup64.dll is not marked for installation," follow these best practices to avoid recurrence:
Error Message:
acrosup64.dll is not marked for installation
Affected Software:
Adobe Acrobat / Adobe Reader (64-bit versions) on Windows
Symptom:
The error appears during installation, repair, or update of Adobe Acrobat/Reader. The installer may roll back or stop without completing.
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.
This contact form is only for IP Access help. Please do not provide confidential information or personal data.