mangli <manga-id> <volumes>
<manga-id> is located in the url. it looks like this: 123abc3b-fedc-1b2l-987bdc09
<volumes> are the volumes that you want to download. e.g.: 1 4-6 8 9
a volume can be none. the none volume contains chapters without volume, that may be waiting it to finish.
get more options, like download and convert a single chapter:
mangli <manga-id>