The v0.14.15 copy that Vinny streamed several months back was a private beta build that was buggy and lacked the standard gamemodes due to compatibility issues.
Luckily, you likely won’t be needing to wait too much longer:
Status update: Dub Mode is fully functioning with the old game modes. You will also be able to tag dub clips with *characters*, and filter for specific characters in a dub pack. Still needs more bug fixes and QoL changes before it’ll be out, however. Thank you for your patience.