You can use this cli to download Line stickers
$ npm install -g sticker-dl
$ sticker-dl line STICKERID
STICKEID
is the number portion of the Line sticker URL.
For. eg. if the sticker url is https://store.line.me/stickershop/product/123/en
Run,
$ sticker-dl line 123
USAGE
$ sticker-dl line STICKERID
OPTIONS
--dest=dest destination to download the stickers
EXAMPLE
$ sticker-dl line STICKERID
This is meant for personal use only.