Troubleshooting Avast Antivirus installation errors caused by corrupted setup files

When trying to run Avast Antivirus installation, the error Package Broken or Not a Valid Win32 Application appears because of an incomplete download. The best solution is to try to download the setup file again.

If the same error appears, check the integrity of the Avast Antivirus setup file you downloaded with the MD5 & SHA-1 Checksum Utility, to find out if your file download is corrupted.

For more information about the MD5 read the following article on Wikipedia:

• MD5 Message-Digest Algorithm

Instructions

To verify that you have downloaded the whole Avast Antivirus setup file which is not corrupted, follow these steps:

1. Download your Avast Antivirus setup file from the following links:
   • Avast Premier | Avast Internet Security | Avast Pro Antivirus | Avast Free Antivirus | Avast Uninstall Utility
   ...and save it to your PC in a location where you will easily be able to locate it, for example on your Windows Desktop.
2. Once you have downloaded your setup file, you can compare its MD5 hash with the correct one using a third party MD5 checksum utility, for example:
   • MD5 & SHA-1 Checksum Utility
   Checking file integrity:
   • Run the MD5 & SHA-1 Checksum Utility.
   • Click the Browse button on the right, ...and open the Avast Antivirus setup file which you have downloaded.
   • Copy the appropriate MD5 hash from the following table which shows the correct MD5 hash of each setup file verified on our server:

     Product edition	MD5 hash
     Avast Premier 18.4.3895.0	505C83CFC4A442879743060441A29B01
     Avast Internet Security 18.4.3895.0	66AC736AB4FFF8542021A6CCDE752F94
     Avast Pro Antivirus 18.4.3895.0	D5F6FF99C3F9A569EB99CC51348F031C
     Avast Free Antivirus 18.4.3895.0	413977EF591CBB85E6264BA34F9DD7DA
     Avast Uninstall Utility	5F2053A8265A49C2429A60C345DCF9C8

     ...paste it to the Hash field and click the Verify button.
3. If a pop-up message indicates that the MD5 hash matches, ...then you have successfully downloaded the whole setup file and you can begin the installation of Avast Antivirus:
   • Installing Avast Premier
   • Installing Avast Internet Security
   • Installing Avast Pro Antivirus
   • Installing Avast Free Antivirus
   Otherwise, if the pop-up message indicates that the MD5 hash does not match, then download your Avast Antivirus setup file once again or try to download it on another PC.