LineStickerDownloader

Currently, only tested on Python 2.7 on Windows environment.
Downloading according to this guide.

Usage

Linedl.py
Interactively ask the sticker set ID and weather or not to treat the sticker as Animated.
For Animated? (y/N): , only y or Y input is treated as True. All other input, including just pressing empty, will be treated as a False

Linedl.py <id>
Download non-animated sticker with the provided ID.

Linedl.py <id> <anyText>
Download animated sticker with the provided ID.

Operation

If <id>/ or <id>.zip already exists, the program will just exit.

Download the sticker to <id>.zip.
Extract the zip to <id>/.
Delete the zip.

Note: The part after this is only tested with non-animated sticker pack.
Read the metadata for Sticker name.
Delete the metadata file and the lower-resolution _key copy of each sticker.
Unless<stickerName>/ already exist, rename <id>/ directort to <stickerName>/.