Below is how to download a vine Video online you can use.
Use Internet Explorer.
In internet explorer browser, you can right-click on any Vine video, and choose the Save video as… option and ave the video with MP4 format.
How to download a vine Video online with online services
Using online Services.
Keepvid.com is a popular service to download videos from many popular websites. You just need to copy The URL of the vine video. If you are on a page with many Vine Videos, you must click the tree dots in the top-right corner and you click View Post Page to get the Vine video’s URL.