Isdone.dll Download _verified_ Windows 7 64 Bit May 2026

How to Fix the ISDone.dll Error on Windows 7 64-Bit

If you are trying to install a large game or software suite on Windows 7 and are met with the error message "isdone.dll is missing" or "Unarc.dll returned an error code -1/5/6/7," you are not alone. This is a notoriously common issue for users running older operating systems or attempting to install repacked games.

However, simply downloading a single file rarely fixes the problem. Here is a breakdown of why this error occurs and the correct steps to resolve it on a Windows 7 64-bit system.

✅ Proper solution steps for Windows 7 64-bit

6. Extract manually (advanced)

Use 7-Zip to extract the installer contents: isdone.dll download windows 7 64 bit

  • Right-click installer → 7-Zip → Extract to folder/
  • Avoid the DLL error entirely by running extracted setup files.

How to Fix isdone.dll Errors in Windows 7 64-bit

  1. Re-register the isdone.dll File:

    • Open Command Prompt as Administrator.
    • Type regsvr32 isdone.dll and press Enter.

  2. Download and Replace the isdone.dll File: How to Fix the ISDone

    • Caution: Be cautious when downloading DLL files from third-party websites to avoid malware.
    • Look for a trusted source or the official Inno Setup website to download the isdone.dll file.

  3. Reinstall the Software:

    • Try reinstalling the software that prompted the error. This might resolve the issue if it was a one-time glitch.

  4. Update Windows and Drivers: Ensure that your Windows 7 and drivers are up to date. Right-click installer → 7-Zip → Extract to folder/

  5. Run a System File Checker (SFC) Scan:

    • Open Command Prompt as Administrator.
    • Type sfc /scannow and press Enter. This will scan and fix any corrupted system files.