I contacted Ubisoft for clarification, this is their answer:
Ubi-Plum @Servizio Clienti Ubisoft Ha scritto: 28/10/2019 @ 18:14
"La ringrazio per il suo feedback riguardo Silent Hunter 5.
La informo che le mod sono contro i termini di utilizzo che puņ trovare al seguente link:
https://legal.ubi.com/termsofuse/it-IT
Se nel frattempo ha altre domande o necessita ulteriore assistenza, non esiti a ricontattarci.
Cordiali saluti,
Nicole
Supporto Ubisoft"
Translated:
"Thank you for your feedback on Silent Hunter 5.
I inform you that the mods are against the terms of use that you can find at the following link:
https://legal.ubi.com/termsofuse/it-IT
If you have other questions in the meantime or need further assistance, don't hesitate to contact us again.
Best regards,
Nicole
Ubisoft support"
Without words .... evidently Ubisoft prefer to sell a buggy game,
Don't they understand that if it is still purchased it is thanks to the work of the Modders? The vanilla game is .... useless! happy them!