Check the current installation status of your ESET product

Do you have an account with Administrator privileges?
You need an account with Administrator privileges. If you are not an Administrator, you cannot upgrade or uninstall. Contact your system administrator to upgrade.

Is the ESET product working properly after a failed upgrade?
After the failed upgrade, open the main program window to verify the ESET product is working correctly.
If the upgrade failed and the ESET product is not accessible, or the ESET product reports a Security alert with multiple messages, proceed to step 2 as soon as possible.

Uninstall your old ESET product or any previously installed antivirus software

Use the ESET Uninstaller tool to manually uninstall an ESET product

Uninstallers (removal tools) for common Windows antivirus software

Install the latest version manually

I have ESET Endpoint Antivirus:

I have ESET Endpoint Security:

For more information, refer to the Install or upgrade ESET Endpoint Security or ESET Endpoint Antivirus on a client workstation Knowledgebase article.