Temporary or local configuration files prevent the updater from executing properly. 4 Methods to Resolve the Error 1. Use the Official Adobe Acrobat Cleaner Tool
Download a fresh, offline installer for Adobe Reader from the official Adobe website and install it. Solution 2: Perform a Clean Manual Uninstallation
If you see a folder named , rename it to Acrobat_Old . acrosup64.dll is not marked for installation
If acrosup64.dll is missing from your system entirely, you may see a variation of the error.
If you are getting this error while using the Adobe Creative Cloud desktop app, try downloading the from the Adobe website instead. These installers are often more "forceful" and can bypass the minor MSI conflicts that trigger the acrosup64.dll error. Temporary or local configuration files prevent the updater
If this guide helped you, consider sharing it with others who encounter the same cryptic message—they’ll thank you for saving their sanity.
Use CCleaner or similar registry cleaning tools for a safer automated approach. Solution 2: Perform a Clean Manual Uninstallation If
If the automated cleaner tool fails, manual intervention in the Windows Registry may be required.
If you are using the EXE installer and it fails, extracting the MSI file often bypasses the error. Download the full Adobe Reader Offline Installer.