Acrosup64.dll Is Not Marked For Installation [99% UPDATED]

"acrosup64.dll is not marked for installation" (often appearing with Error 2753

Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\ acrosup64.dll is not marked for installation

Disable Antivirus: Temporarily turn off your antivirus or firewall during the installation process. "acrosup64

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. acrosup64.dll is not marked for installation

: The installer thinks a "lesser" version is still installed because of orphaned registry entries. Corrupted DLL acrosup64.dll

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.