> When I write a command
> httrack rathole.ru +*.zip
By default, HTT downloads everything from the starting site only. Adding a
+*.zip simply adds zip's from any referenced site. 
Normally you don't want to add filters. Use the near flag (get non-html files
related) which gets everything from anywhere. Use filters only if you
want/don't want specific files.

So just mirroring it should have gotten the zips.
Log file says:
12:16:29 Debug:  build relative link music/drat002.zip with rathole.ru/
12:16:29 Debug:  built relative link music/drat002.zip with rathole.ru/ ->
rathole.ru/music/drat002.zip
12:16:29 Debug:  link forced external at rathole.ru/music/drat002.zip
12:16:29 Debug:  External: rathole.ru/music/drat002.zip

I don't know why it is forced external, shouldn't be.
Adding +*.zip didn't help. Adding external depth didn't help either. Another
bug for Xavier