PSA: if you aren't seeing the L2D animations or model, the steam version of the demo seems to be perfectly functional with all the L2D animations. I installed the demo on steam (free) and it seems that all the broken animations are back.
Just remember hide the game and set it as private before playing so your friends don't see you're gooning
(right click the game in your library, then go to properties in the dropdown, then inside the privacy section. You should see "hide game" and "set as private". Setting both will ensure that steam wont show you playing the game and wont record it on your profile.)
Screenshot of the first intro scene in the steam version for proof, as you can see, the model is actually visible:
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