How to edit Category Archive for Wordpress Download Manager

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Please help, which part that should i open and edit to change the style of this category page.

For an example:

www.mydomain.com/downloads ---> This can be edited / customized
www.mydomain.com/downloads/windows ---> This category has all windows package download

I want to customize windows category page. Is there any easy way using builder? or i have touch php code from CPanel?

Which folder / file should i touch it? 
public_html/wp-content/plugins/download-manager --> and which folder / files?


public_html/wp-content/plugins/wpdm-archive-page or any wpdm-xxx?

I hope my questions is clear enough

Code:

https://www.wpdownloadmanager.com

Thank you.