Acrosup64.dll Is Not Marked For Installation 2021 ⚡

acrosup64.dll is not marked for installation — a tiny ghost in Program Files, an unused whisper. Windows lists it in a column of red, a filename like a forgotten prayer, its version number worn thin by updates that never called its name.

Step-by-Step Solutions

Below are the most effective solutions, ranked from least to most intrusive. Always restart your computer after each major step to clear temporary locks and caches.

  1. Use 7-Zip or Universal Extractor to open the .exe installer file like an archive.
  2. Extract acrosup64.dll manually to your Desktop.
  3. Copy the file to C:\Windows\System32\.
  4. Open Command Prompt as Administrator.
  5. Run: regsvr32 C:\Windows\System32\acrosup64.dll
  6. You will see "DllRegisterServer succeeded."
  7. Now, run the original installer. It will see the file is already registered and skip the "mark for installation" check.
  1. Open Command Prompt as Administrator (search cmd, right-click, run as admin).
  2. Navigate to the folder containing acrosup64.dll. Typical paths: 
    cd "C:\Program Files\Adobe\Acrobat DC\Acrobat"
    Or for Reader: 
    cd "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader"
  3. First, unregister the DLL: 
    regsvr32 /u acrosup64.dll
  4. Then, re-register it: 
    regsvr32 acrosup64.dll
  5. You should see a success message. Restart your PC.

Check Version: Ensure you aren't trying to install a 32-bit update over a 64-bit base version (or vice versa). Error 1723 - Problem with Windows Installer Package

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acrosup64.dll is not marked for installation — a tiny ghost in Program Files, an unused whisper. Windows lists it in a column of red, a filename like a forgotten prayer, its version number worn thin by updates that never called its name.

Step-by-Step Solutions

Below are the most effective solutions, ranked from least to most intrusive. Always restart your computer after each major step to clear temporary locks and caches. acrosup64.dll is not marked for installation

  1. Use 7-Zip or Universal Extractor to open the .exe installer file like an archive.
  2. Extract acrosup64.dll manually to your Desktop.
  3. Copy the file to C:\Windows\System32\.
  4. Open Command Prompt as Administrator.
  5. Run: regsvr32 C:\Windows\System32\acrosup64.dll
  6. You will see "DllRegisterServer succeeded."
  7. Now, run the original installer. It will see the file is already registered and skip the "mark for installation" check.
  1. Open Command Prompt as Administrator (search cmd, right-click, run as admin).
  2. Navigate to the folder containing acrosup64.dll. Typical paths: 
    cd "C:\Program Files\Adobe\Acrobat DC\Acrobat"
    Or for Reader: 
    cd "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader"
  3. First, unregister the DLL: 
    regsvr32 /u acrosup64.dll
  4. Then, re-register it: 
    regsvr32 acrosup64.dll
  5. You should see a success message. Restart your PC.
  • Upgrading Adobe Acrobat from an older version (e.g., Acrobat XI to Acrobat DC).
  • Uninstalling Adobe Creative Cloud applications.
  • Installing a new Adobe product when an older, partially removed version still has registry entries.
  • Running a repair on Microsoft Office (less common, but possible if Office integrates with Adobe PDF add-ins).

Check Version: Ensure you aren't trying to install a 32-bit update over a 64-bit base version (or vice versa). Error 1723 - Problem with Windows Installer Package acrosup64