Hi There,
If you will make some customization in the style, then you just no need to update/replace the updated files directly when we will provide an update of the style.
This is because, if you will update the style to replace new files, then all of your customization will go.
In this issue, you could backup your customized style files before replacing the updated files. After then, you need to update the style to follow our changelog that we will provide when we will update the style.
Best Regards,
ThemeLooks Support Team