PegWeb on "[Plugin: Download Monitor] 403 Permission Denied when accessing file"

I am new to this plugin. I added a download with several files in it. When I try to link directly to one of the files in the download I get the "403 Permission Denied" message. If I tr to access the URL link displayed in the download information box on the right it just shows me the homepage. Any ideas?

https://wordpress.org/plugins/download-monitor/