Rock star theme free vs pro (There has been a critical error on this website)

First, I tried the free version, and after feeling satisfied with it, I decided to buy the Pro version. I was able to install it, but I encountered an issue when trying to use the Pro version that I purchased. The error message I’m receiving is: "There has been a critical error on this website. Please check your site admin email inbox for instructions." I’ve made a video of my issue here: https://www.youtube.com/watch?v=g9n9GdU0ERc I’ve tried multiple troubleshooting steps, such as deactivating all plugins, adding the "true/false" debug text to the PHP config, but I haven’t been able to figure out what’s causing the problem. Could you suggest a solution for this issue?