Thanks for contacting us here about this extension.
What is the service support of your Company? I bought WP File download, I just ask to change the color for 3 days, no one can assist me.
First, we are sorry for not responding to you as expected. Our dev could repond to you faster if you let him know exactly what you want to customize.
As I see, you provided not enough information to our dev. However, after your clarification, he replied you few hours ago.