You can download the update directly on your Windows Phone through the Windows Phone Store or by using the link which follows:
Press the Search button on your Lumia phone, tap Vision and then scan the following barcode by pointing your device camera toward it
LINE for Windows Phone has the following features:
- Easy, Fun and Convenient Send messages, photos, videos, voice messages, as well as location info in an instant!
- Link your Smartphone - PC - Tablet Use the smartphone version while on the move, PC/MAC versions on your desktop, and a web-browser version for tablets. Stay in touch wherever life may take you!
- Lots of Stickers Convey your emotions and make your chats more fun with a huge variety of fun stickers! There are 4 free sticker-sets waiting to be downloaded by you.
- New Windows UI - Metro This version of LINE uses the new Metro UI system, unique to Windows Phones. Enjoy increased usability with the Panoramic View and the Application Bar features.
- Added a setting to allow/deny login from PC/Win8 devices
- Other minor bug fixes and improved stability