3. Clear Windows Installer Registry Entries via Revo Uninstaller

: Run the AcroRead.msi directly from the extracted folder rather than using the setup bootstrapper. To help you further, could you tell me: Are you using Adobe Acrobat Pro or the free Reader ? Is this a personal computer or a company-managed device? Did this happen during an update or a fresh install ? error the file acrosup64.dll is not marked for installation

Recap of the most reliable fixes:

. It indicates a conflict where the installer script references a file that the system believes is already incorrectly present or is not designated for the current installation phase. Core Causes Corrupt Registry Entries

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.