Error “Cannot connect to the application installation source”

Cause

• The PC has a firewall installed that blocks the Internet connection which is required for installation. 
• The operating system has incorrect proxy server settings entered.
• Kaspersky servers are temporarily unavailable due to maintenance.

Solution

• Try to install the application again later (in an hour or so).
• If you have a firewall installed on your computer, make sure that it doesn’t block the application’s Internet connection. See this article for more information.
• Reset proxy server settings in the operating system. For instructions, see this article.
• Change the DNS address in the network settings. See this article for instructions.
• Reset the network settings. For instructions, see this article.
• Try to connect to the Internet using your mobile phone. See the instructions for Android and iOS.

What to do if the error persists

If the issue persists, submit a request to Kaspersky technical support by choosing the topic of your request.