I've looked everywhere but can't find an answer and don't understand much of
this...

I want to download the entire site of:

<https://dealers.janome-america.com/apprisenet/>

When first clicking on this link, a window pops up requiring a username and
password.

How do I set this up so it will log itself in and download every file in it's
site structure?
Errors:

02:29:57 Warning:  Cache: damaged cache, trying to repair
02:29:57 Warning:  Cache: 0 bytes successfully recovered in 0 entries
02:29:57 Warning:  Cache: error trying to open the cache
02:29:57 Error:  "Unauthorized" (401) at link
<https://dealers.janome-america.com/apprisenet/> (from primary/primary)
02:29:57 Info:  No data seems to have been transfered during this session! :
restoring previous one!