Hello,
Clearing the cache worked and the modal windows appear now.
For the link this is what I did and I got it to work. I am using Avada builder so I needed to get only the necessary base elements so I could use the fusion builder buttons.
1. Image below I copied the direct URL Download link.

2. Then I needed the package ID

3. Required class for Email Locked URLS `class=”wpdm-download-link wpdm-download-locked
Once I had all these elements I could create a button in Avada and add the necessary information and the email prompt worked perfectly.