I also have difficulty with the registry. The Masterslider works perfectly in Gutenberg, but an update to Pro, which I wanted to give it to him and bought it, does not work. Previously, after activating Autoupdate, the plugin window showed several fields for entering name and purchase code. They are no longer available or lost when compared to the current WP versions. The support is unfortunately cumbersome and frustrating.
I ask you for another way – please! Although I was on the Internet in 1989 (I am 80 years old), but I have never worked with php or mysql. Previously there was the possibility online in the plugin window to provide automatic upload, where you could then enter the license when activating. Is not that possible anymore?