You save my day. My 614/672MB download failed.
I did similar method using uGet in Linux. Here's what I did.
1. Login in sammobile from browser.
2. Get the download link from sammobile.com
3. Export the cookie to a .txt file
4. Add new download, link (2)
5. Open properties of the download > Advanced. Set "cookie file" field to the exported cookie file (3)
6. Start download
Man. Thanks a lot.