Troubleshooting installation errors caused by corrupted setup files

If you see the error Package Broken or Not a Valid Win32 Application when trying to run installation of an Avast product on your Windows PC, the setup file may be corrupted or incomplete. To fix this issue, follow the steps in this article.

Download your Avast product again

Select one of the following links:

Avast Antivirus products for Windows

• Avast Premium Security (previously Avast Premier) | Avast Free Antivirus | Avast Uninstall Utility

Older Avast Antivirus products for Windows

• Avast Internet Security | Avast Pro Antivirus

Other Avast products for Windows

• Avast Cleanup Premium | Avast SecureLine VPN | Avast AntiTrack | Avast Driver Updater

Ensure the setup file is whole and uncorrupted

If the error continues to appear, check the integrity of the setup file you have downloaded:

1. Go to the folder where you saved the avast_(...)_setup_(...).exe setup file (by default, all files are saved to your Downloads folder). The file name includes the name of your Avast product and either online or offline, for example avast_premium_security_setup_offline.exe.
2. Right-click avast_(...)_setup_(...).exe and select Properties.
3. Go to the Digital Signatures tab. You should see either 1 or 2 digital signatures from AVAST Software s.r.o..
   If you don't see the Digital Signatures tab, your setup file is incomplete or corrupted. Find solutions in the I have no Digital Signatures tab section of this article.
4. Click a digital signature to select it, then click Details.
5. Locate the message displayed below Digital Signature Information. Depending on which message you see, refer to the relevant instructions below.