We are using the plugin and have some files which we have added a password to. When users try to download them it comes up with a message saying invalid-download-link after we have entered the password.
Hope you are well. And sorry for the inconvenience. can you please share the related URL? if possible, can you please, give your temporary wp-admin login details in a private reply for checking the issue?
I have checked that there are many plugins installed on your site. I think it may have a conflict between your plugins or theme. can you please enable/disable other plugins for checking, you may also switch the theme to another for checking. please check and let me know then.