Do I need a new webdesigner or an upgrade?

Hi- I hired a web designer to design and integrate a new sales page for my training video. She told me today that user interface would be poor due to my having SquareSpace 7.0. Is that true?

Without having all the details of what you want for you new sales page, it is hard to make an assessment about the designers statement. She is there on the ground, we aren't.

v7.0 and v7.1  are certainly different and v7.1 is the latest and "greatest". Each version has it's pros and cons. v7.1 gets the most attention from SS and where all new features go. Some of them going back to v7.0 when it makes sense for SS to do so.

It is possible that the template you are using for your v7.0 site is making a particular design difficult. Or, that some feature that is available on v7.1 isn't on v7.0. Again without more detail is is unlikely we can help.