Please do make a plugin for Viki.com to download MP4 video and EN/CZ/SK subtitles.
Example:
1. Dorama Love and Destiny (China, 2019)
[
www.viki.com]
2. To view episodes
[
www.viki.com]
3. Download episode as 480p and English/Czech/Slovak subtitles, this service can be use:
[
www.tubeoffline.com]
THANK YOU.