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Visa and Mastercard require that that text be displayed. Have you talked with Visa headquarters for specific permission to violate their TOS?

If you're using PayPal Website Payments Pro in the UK, then it's in your customers' best interests to tell them that they're about to be redirected to another page to enter the password they've...

at this time its only applicable to PayPal Website Payments Pro merchants other gateways dont use it at this time

You'll need to track down the files that the popup is looking for, by looking in the URL of that popup, and finding the file(s) that it's trying to load, and upload them to your server.
Your...

Sounds like you didn't put in all the files from the new version.

That text is required by your card company. Why are you trying to remove it?