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If you have tried all six solutions and still see the error, the issue may be deeper:
Third-party services (antivirus, firewalls, system optimizers) can lock or hide acrosup64.dll from the installer.
If you cannot uninstall the app through the control panel, third-party uninstallation software can forcefully strip out the bad keys.
The error "acrosup64.dll is not marked for installation" is a classic example of a Windows Installer state error. While it can be frustrating, it is rarely a sign of a virus or hardware failure. In 90% of cases, using the official to remove the corrupted install and reinstalling the software fresh will permanently resolve the issue.
If you have tried all six solutions and still see the error, the issue may be deeper:
Third-party services (antivirus, firewalls, system optimizers) can lock or hide acrosup64.dll from the installer. acrosup64.dll is not marked for installation
If you cannot uninstall the app through the control panel, third-party uninstallation software can forcefully strip out the bad keys. If you have tried all six solutions and
The error "acrosup64.dll is not marked for installation" is a classic example of a Windows Installer state error. While it can be frustrating, it is rarely a sign of a virus or hardware failure. In 90% of cases, using the official to remove the corrupted install and reinstalling the software fresh will permanently resolve the issue. acrosup64.dll is not marked for installation