Hello,
Sorry for the delay because of the weekend.
However I found that you used this shortcode.
[wpdm_all_packages login=1 items_per_page="20" order_by="title" order="ASC" cols="title|categories|update_date|download_link" colheads="Titolo|Categoria|Aggiornato Il|"]
In this shortcode just remove the parameter login=1
to show downloads without login.
However, the cache plugin was causing the issue. I have deactivated that, it fixed the issue with a new subscriber role I created.. In this case, it would be appropriate to make an exception for the wpdm page of the cache plugin or disable/change the cache plugin to recheck the issue.
Thanks