You can download survey responses from two places:
The Survey Analytics page: best for downloading responses from a single survey used across multiple projects
The Survey Campaign page: best for downloading responses from a single survey used on a single project
Steps
Go to either
the Survey Analytics page (and select the survey and project(s) you are analysing)
or
The results will load
Press the Download Responses button
A CSV file is generated that has a row for each answer for each contact to each question