Doesn't work with sub-directory WP installs

i have the same issue.
https://www.ads-software.com/support/topic/updated-to-30-cant-view-or-download-goes-to-page?replies=20

there is no reply to this issue since month!

Same issue here.

I figured this out. I dug around in the plugin files, and found where it was referencing the wordpress core files instead of the site address.

Here’s what I did:
In the class.wp-publication-archive.php file on line 77, change site_url to home_url. From what I understand, home_url is your domain, and site_url is where you core files are located.

See this for more info.

Hope that helps. Not a great idea to mess with plugin files in case of updates, but hopefully this will be fixed in the next release.