ASSRT is a simple GUI tool for batch conversion of .ass subtitle files to .srt subtitle files.
I made this tool for two reasons. Firstly, I wanted to learn the basics of WPF. And, secondly, there aren't any batch converters online (that I know of atleast).
If you wanna build from source be my guest but I will also provide a link to the exectutable. Tested and working on Windows 10.
Here you can download the executable.