Wordpress Theme Update with Zip file

We have downloaded an update for our Wordpress theme on Envato.
Do we upload the whole .zip file, and will it wipe any of the files on our website?
Any help much appreciated, haven’t updated a theme using a zip before


Please check the theme documentation hopefully you will get necessary support.

I would like to recommend please contact theme Author and let them know How to Contact your purchased theme Author, theme author will be happy to assist you.