I am also unable to find it via the direct install link or search.
Assuming that the current release version is 0.0.1
https://www.twitch.tv/ext/laaxfb9k5l54yodrrq56tlnply3vmn-0.0.1 sends me a time machine page.
And logged out auto find https://www.twitch.tv/ext/laaxfb9k5l54yodrrq56tlnply3vmn the same
This usually indicates it’s not actually released, or something else is awry. Whats the current release version number?