Using the raw MSI package bypasses the faulty executable setup wrapper.

If the cleaner tool doesn't work, manual removal of hidden folders and registry keys is often necessary. 1. Delete AppData Folders Press Win + R , type %AppData% , and hit Enter. Delete the folder.

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.

The error is a critical Windows Installer conflict that completely blocks users from installing, updating, or uninstalling Adobe Acrobat or Adobe Acrobat Reader. This error triggers when the Windows Installer database (MSI) detects cached, corrupt, or leftover registry data from a previous 64-bit Adobe installation. Because the installer believes a newer version of the acrosup64.dll file already exists on the system, it refuses to overwrite or handle the file, grinding the deployment process to a halt.