Wordpress X theme from Envato upload problem after new install

I set up a droplet with a one click wordpress install following the Digital Ocean tutorial. I have not set up to point my domain name at the IP address. I’m trying to change from the default theme by uploading the x.zip file (this is the file themeco indicates is for the update) using the wp-admin panel Add Theme -> choose file but I get the error message “Are you sure you want to do this?” and a clickable link “please try again”