Corrupt or Invalid Signature
PDF2XL Support avatar
Written by PDF2XL Support
Updated over a week ago

You've received the following message when downloading PDF2XL:  The signature of PDF2XL-Setup-Full-6.5.msi is corrupt or invalid

This is a known issue when using Internet Explorer.

If you are not able to use a different browser, then please follow these instructions:

  • Once you get the error message “The signature is invalid” click the option to "View Downloads”.

  • Locate the download and right-click on the file. Select "Run Anyway". 

  • If you encounter a Windows warning screen like the one below, check the box stating "I understand the risk and want to run this app", then click "Run Anyway".

Alternatively, you may need to change some settings within your internet options.
 You can access these settings via the Control Panel or in your browser options: 

  • Control Panel option: Start > Control Panel > Internet Options > Advanced tab > go to Step 1 (below)

  • Browser option: Internet Explorer > Tools > Internet Options > Advanced > go to Step 1 (below)

Step 1: Check the box next to "Allow software to run or to install even if signature is invalid"

Step 2: Click on the "OK" button to close.

Not sure if you should trust this site?

The CogniView web address is 

A secure site's web address should begin with https:// not http://. The extra s in https:// stands for “secure”.

You should also see the padlock icon in your browser address bar. In Internet Explorer this should be gold. in Microsoft Edge, it's grey or green.

If you see a lock button next to a website’s address in Microsoft Edge, it means:

  • What you send and receive from the website is encrypted, which makes it difficult for anyone else to get this information.

  • The website is verified, which means that the company running the site has a certificate proving they own it. Click the lock button to see who owns the site and who verified it.

  • While a grey lock means that the website is encrypted and verified, a green lock means that Microsoft Edge considers the website more likely to be authentic. That’s because it’s using an Extended Validation (EV) certificate, which requires a more rigorous identity verification process.

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