You'll need Python 3 to run bc-art. You can check if it's installed by running python3 --version or python --version. If you haven't got Python 3, you can download it from python.org or your package manager.
Download the repository (click "Code" above, then "Download ZIP", or clone it with git). Then cd into the repository and run this:
python3 -m pip install .
It'll install into your site-packages or other Python binary installation folder, so you should be able to run with bc-art; otherwise, try python3 -m bc_art.
Typically, just provide the URLs for the discographies, albums, or tracks you want to download artwork for, and bc-art will handle the rest. If you're working with HSMusic data, also provide --hsmusic, which will write to more suitable filenames.
Output is saved into the same folder you're running bc-art from, and placed under a folder based on the discography - for example, homestuck if you're downloading artworks from https://homestuck.bandcamp.com/.
If you'd like to customize further, see the option list below, or by running bc-art --help.
usage: bc-art [-h]
[--hsmusic] [--no-track-nums]
[--dry] [--quiet] [--verbose]
[urls ...]
positional arguments:
urls discography, album, or track URLs to download art for
options:
-h, --help show this help message and exit
--dry dry run: don't download or write any files,
only print what what actions would be taken
--overwrite overwrite existing files instead of
skipping respective downloads
--hsmusic output directories and filenames in the format
hsmusic-wiki uses
--no-track-nums don't output track numbers in filenames
(default for --hsmusic)
--quiet don't show any logging or progress bars
--verbose print results as they are downloaded