When you download your validated results from Zerobounce.net, we send a password to your email, so you can access the zip file you downloaded.
The password should arrive in email soon after you download your results. Every time you download any results, even if it's the same results, a new password will be sent to you.
We do this for the security of your data, to protect you in case you left your PC unattended or if someone got access to your account. They wouldn't be able to get access to your data without the password that's emailed to you.
2-factor authentication is very important.