Hi and thanks for so prompt reply!
No, it shows simply opening the page, whose this is URL: https://www.fondazionecdlmilano.it/_prova-pdf/
Now you’ll see 2 download buttons as I wanted to test another download and created 2nd package.
If I preview the package itself then no errors occurs
I have created page with Elementor, as said, and selected the ‘WPDM Packages’ widget from “WordPress” list as I have not installed Elementor add-on yet.
I have been using WPDM to just download PDFs on another website since 4-5 years now and never had any issue, with Elementor page builder for this site also. Only difference might be I was using shortcode on that site…