Acrosup64.dll Is Not Marked For Installation Online
Errors like acrosup64.dll is not marked for installation are a symptom of software rot. They happen because developers assume a clean environment, while users live in a messy one—full of old drivers, partial uninstalls, and permission ghosts.
The next time you see this error, don't curse the computer. Recognize it for what it is: A tiny miscommunication between an installer and an operating system. And now, you have the map to fix it.
Final Pro Tip: After fixing this, run a proper uninstaller like Revo Uninstaller or BCUninstaller to clean up any remaining DLL debris. Your future self will thank you.
Have you encountered a different "not marked for installation" error? The same logic applies to other DLLs like msvcp140.dll or vcruntime140.dll. The fix is always about ownership, deletion, and forcing a fresh registration.
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.
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 acrosup64.dll is not marked for installation
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.
Here’s a good bug report for the issue “acrosup64.dll is not marked for installation”:
Title:
acrosup64.dll is not marked for installation – component missing during Adobe Acrobat setup
Environment:
Steps to Reproduce:
Observed Result:
The installation log contains the entry:
acrosup64.dll is not marked for installation.
The file acrosup64.dll is missing from the installed directory (e.g., C:\Program Files\Adobe\Acrobat DC\Acrobat\), and certain PDF operations (e.g., accessibility or save-as functions) fail.
Expected Result:
acrosup64.dll should be installed to the product folder as part of the core Acrobat installation.
Impact:
Workaround (if found):
Manually copy acrosup64.dll from a working system into the Acrobat folder and register it with regsvr32, but this is not a permanent fix.
Additional Information:
Suggested Fix (for administrators):
Would you like a PowerShell script to detect if the file is missing, or a template for a bug tracking system (e.g., Jira, Bugzilla)?
The Frustrating Error
It was a typical Monday morning for John, a graphic designer, as he sat down at his computer to start his day's work. He had a deadline to meet and was eager to dive into his project. However, as he booted up his computer and tried to launch Adobe Photoshop, he was greeted with an error message that made his heart sink:
"The file acrosup64.dll is not marked for installation."
John had no idea what this error meant or how to fix it. He tried restarting his computer, but the error persisted. He then attempted to reinstall Adobe Photoshop, thinking that maybe the installation had gotten corrupted, but that didn't work either.
The Search for a Solution
Frustrated and running out of time, John turned to his trusty search engine to find a solution. He typed in the error message, along with his version of Windows and Adobe Photoshop, hoping to find someone who had encountered the same issue.
After scrolling through several forums and blogs, John came across a post from a user who had experienced a similar error. The user had mentioned that the problem was caused by a missing or corrupted file in the Windows registry.
John decided to try the suggested solution, which involved using a registry cleaner to fix the issue. He downloaded and installed the software, then ran a scan to identify and fix any problems.
The Breakthrough
As the registry cleaner finished its scan, John held his breath, hoping that it would find and fix the issue. A few minutes later, the software reported that it had found a problem with the acrosup64.dll file and had successfully repaired it.
John rebooted his computer and launched Adobe Photoshop once again. This time, the software launched without any errors, and John was able to start working on his project.
The Lesson Learned
John learned a valuable lesson that day: even the most obscure error messages can be resolved with patience, persistence, and the right guidance. He also realized the importance of regularly maintaining his computer's registry to prevent such issues from arising in the future. Errors like acrosup64
From then on, John made sure to regularly clean and optimize his computer's registry, and he was able to work on his projects without any interruptions.
The Moral of the Story
The story of acrosup64.dll not being marked for installation serves as a reminder that:
By following these principles, you can overcome even the most frustrating errors and get back to work with minimal disruption.
Title: Resolving the "acrosup64.dll is not marked for installation" Error in Acrobat and Reader
Introduction
Encountering a DLL error during a software update or launch is a common frustration for Windows users. One specific and somewhat cryptic error message that plagues users of Adobe Acrobat and Adobe Reader is: "acrosup64.dll is not marked for installation."
This error typically halts the installation of an update, preventing the user from patching security vulnerabilities or accessing new features. This guide explains the root cause of the issue and provides step-by-step solutions to resolve it.
Press Win + R, type regedit. Backup your registry first (File → Export).
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.
Level 3: Microsoft Program Install and Uninstall Troubleshooter (Success Rate: Medium)
Level 4: Manual Registry Edit (Advanced)
If acrosup64.dll is missing from your system entirely, you may see a variation of the error.
Microsoft offers a dedicated tool to fix Windows Installer corruption. Have you encountered a different "not marked for
Sometimes the DLL itself is correctly present, but its registration in the Windows Registry is broken.
Important: If the file is missing entirely, skip to Solution 5.