Theme Upload Error: "Are you sure you want to do this? Please Try Again"

How do I resolve this? Trying to upload BE Theme to my wordpress site and this is the error that I’m getting.

In most cases that is a hosting issue - use FTP and it should work

This exact thing is happening to me to with this exact theme! Ive used this theme tons of time

Did you ever find a solution to this?
I’m currently having the same issue with the Gastro theme.

Using ftp should fix it