In order to get the free game you need to do the following:
- Download and install of Twitch app (currently Windows only).
If you already have a Twitch account, just log into your account. - Link your Uplay account with Twitch
- Watch the speedrun attempt of Rayman 2: The Great Escape by Glackum for at least 30 minutes
- Receive Rayman Origins for free on Uplay via Twitch Drops.
The Rayman 2 speedrun event will start 10 June 2019 at 1:30 p.m. ET/10:30 a.m.PT/17:30 GMT
Enjoy!