Fixing Error Installer Integrity Check Has Failed (NSIS Error)

Sometimes users facing Installer Integrity Check Has Failed error while installing applications or games, it’s also known as NSIS Error. This error occurs on almost all Windows versions: Windows XP, 7, 8, 8.1, 10. Now let’s take a closer look on this error, discuss why it can occur and how to fix it.

What’s the Installer Integrity Check Has Failed Error?

Installer integrity check has failed is an error that occurs when you are trying to install an application that uses an installer that is built (the error occurs when it’s corrupted or incomplete).

Installer Integrity Check Has Failed fix

* Nullsoft Scriptable Install System (NSIS is an open-source community that develops the software which installs software within Windows operating system.

What’s the Causes of NSIS Error?

Let’s take a look at the possible causes of Installer integrity check has failed error:

  1. The application is damaged:
    • You’ve ejected the drive before the installation process was fully finished;
    • You’ve downloaded installer incompletely;
    • You’ve didn’t save the installer on the drive completely.
  2. Virus infection. Most often malware and viruses are hiding at installer file and damaging it. As a result of such infections, users are facing Installer integrity check has failed error. So it’s pretty important to scan the installation file with antivirus before start.
    Tip. We recommend you not to install the applications from unknown sources, that can help you avoid a lot of problems and save your data in the future.
  3. Insufficient space on the drive. In case there is not enough space on the drive, the installation process will be stopped or won’t finish completely;
  4. Error due to Firewall. In case the firewall is enabled on the PC, it can block the installation of the application. In such situation you need to temporarily disable antivirus until the installation process finishes;
  5. Application incompatibility. The issues can occur when installing the application that is developed for 32-bit Windows version on 64-bit OS machine (and vice versa).
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How to Fix Installer Integrity Check Has Failed Error?

The simplest solution on how to fix the error is to install the application/game from other different drive or download it from other source. If that didn’t help you, try to follow these steps:

  1. Check the installation file for viruses before start! To do this you can use any antivirus or, for example, Windows Defender Security Center;
  2. Go to Settings -> Update & Security -> Windows Defender -> Click on Open Windows Defender Security Center. Now press Virus & threat protection, then click on Advanced scan;
    Installer Integrity Check Has Failed defender
  3. Check on Custom scan and press Scan now;
    Installer Integrity Check Has Failed scan
  4. At this step you need to select the folder to scan. After that click OK and the process will start. After that the Windows Defender will check the installer for viruses and delete them.

There is one more solution on how to fix the error—try to disable antivirus software during the installation (antivirus can block some components of the installer because of virus suspicious).

In case the steps with antivirus didn’t help you, try to check the hard drive for errors. To do this follow the instructions:

  1. Go to This PC -> Right click on Local disk C: -> Properties;
    Installer Integrity Check Has Failed disk
  2. In new window switch to tab Tools -> click on Check in section Error checking;
    NSIS Error
  3. After that the utility will check and repair all errors on disk.

Important! It’s better to perform the action for all local discs, after that the application should start normally.

The error can also appear due to unknown symbols in the name of the installation file (you can try to change them to the common symbols manually).

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Tip. To avoid repeating of the issue, you need to update drivers and install all necessary system updates for the operating system timely.

In conclusion (if all the above steps didn’t help you) try to run the installation wizard from another computer. In case the problem persists – most likely, the installation wizard file is damaged. Then you need to contact the seller and ask for new copy.

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