How to Fix “Unarc.dll returned an error code” [Step-by-Step Guide]

You’re trying to install a game on Windows 10/11, but you can’t finish the installation due to the error “Unarc.dll returned an error code”. The error code could be something like -1, -5, -6, -7, -11, -12, -14, etc.

It’s annoying, but not to worry. The error usually occurs due to the following reasons:

  • Corrupted or missing DLL files
  • Blocked installation

To fix the error, you can try the following five methods:

Method 1: Download and install the game again
Method 2: Download and install the required DLL files
Method 3: Disable your antivirus software
Method 4: Disable Windows Defender
Method 5: Install the game in Safe Mode

Method 1: Download and install the game again

If the downloaded setup file is corrupted or not downloaded correctly, the error “Unarc.dll returned an error code” can occur. To fix the error, the simple method you can try is to redownload the game and try installing the game again.

If Method 1 doesn’t work for you, you can try Method 2.

Method 2: Download and install the required DLL files

The error can be caused by missing or corrupted DLL files (the unarc.dll file and the isdone.dll file), which are required to play the game. To fix the error, you can try downloading and installing the unarc.dll file and isdone.dll file with a third-party DLL tool.

To do this, you can use DLL-files.com Client. With DLL-files.com Client, you can download a DLL file with just one click, then install the file easily on your computer. Besides, you don’t need to verify your Windows version, and you don’t need to worry about downloading a wrong file.

To download and install the Unarc.dll file and the isdone.dll file, you just need a few clicks:

1) Download and install DLL-files.com Client on your computer.

2) Launch the program and type “unarc.dll” into the search box and then click on the Search for DLL file button.

3) Click the unarc.dll link.

4) Click the Install button, then you’ll be prompted to buy a license key and register the program to install the file.

install the unarc.dll file

5) After you’re done with installing the unarc.dll file, install the isdone.dll file with the same steps.

6) Restart your computer for the changes to take effect.

Try installing the game again and check to see if the error still occurs. If the error still occurs, continue to try Method 3.

Method 3: Disable your antivirus software

If you have any antivirus software running in the background, disabling them may help fix the error as these software may block your game installation by deleting some necessary files.

Disable your antivirus software temporarily then check to see if you can install the game without the error. If your antivirus software is the cause, you may need to uninstall them or use another antivirus software.

If Method 3 doesn’t work for you, continue to try Method 4.

Method 4: Disable Windows Defender

In some cases, Windows Defender can block the game installation and present you with the “Unarc.dll returned an error code” error. To fix the error, you can try disabling Windows Defender.

Important: While Windows Defender is disabled, be careful what you download from the internet or what links you click.

Here’s how to disable Windows Defender:

1) On your keyboard, press Win+S to open the Search box.

2) Type “windows security” into the Search box and select Windows Security from the result.

3) Click on Firewall & network protection on the left side.

4) Turn off Microsoft Defender Firewall for Domain network, Private network and Public network. To do so:

a) Click on the link (Domain network, Private network or Public network).

b) Click the toggle switch under Microsoft Defender Firewall to turn it off.

how to disable windows defender

If Method 4 doesn’t work for you, continue to try Method 5. Remember to re-enable Windows Defender so your computer is under protection.

Method 5: Install the game in Safe Mode

If none of the above methods works, the last method you can try is to install the game in Safe Mode.

Firstly, you’ll need to access Safe Mode. To do so:

1) On your keyboard, press Win+R to invoke the Run box.

2) Type “msconfig” into the Run box and click on OK. Then the System Configuration window will pop up.

3) At the System Configuration window, go to the Boot tab and check the box next to Safe boot, and then click Apply -> OK.

4) Restart your computer then your computer will boot in Safe Mode.

Secondly, install the game.

Once done, open System Configuration again and uncheck the Safe boot box.

Hopefully you find the article helpful. If you have any questions, feel free to drop a comment below. I’ll get back to you ASAP.

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