Is there any way I can download a whole album even if I don't
know all the songs.

That depends upon what's on offer. If anybody is sharing one long mp3 that is an album, then the answer is yes. Most mp3's have id tags which help to identify it's details (how many details are supplied depends upon how many the person who encoded the mp3 was bothered to include; eg: album, year, title no., etc.) In order to see these details, once you have your search results up, hover your mouse cursor over the song & it's mp3 tag info will be displayed for a few secs.
Click Audio in the search criteria window of LW & put in the band & musician names into appropriate boxes. This will help you to get the results you want (which can also include mp3 tag info.) Another way to search is to do a Any Type search & put the musician's name, space, dash, space, album/song name.
Keep in mind some people don't always name songs & other details correctly (which annoys everybody!)
I hope this is helpful for you.

Does that mean it was helpful? mp3's are generally individual songs, so you'd need to dwnld each individual one. If anybody knows a better way, I'd love to hear it. If you get good search results & if the mp3 tags are well listed (eg: title 3 of 10), then you'll know how many tunes are on that album & dwnld them all from your search results.