You need an Ivans account (mailbox). Ivans is the mailman of the Insurance industry
The account is free. You need to contact one of your carriers and ask them to "sponsor" you for an Ivans account.
Once you obtain your Ivans mailbox, all other carries start sending your data there. We pick it up 4 times daily and place it in your Nowcerrts account.
The only problem is that not all carriers offer that.
Here is a list provided by Ivans (and TeamUp). Some carriers (like Progressive) offer direct downloads (bypassing Ivans).
The best thing to do is contact your carriers and ask them if they offer carrier downloads and how those are offered (Direct, Ivans, or TeamUp).
Hope this helps.
Here is a related link from Ivans: