I had the same problem. Switch to experimental version and if it still won't download, go to the local files tab of properties and hit verify integrity of game cache. That worked for me.

I've restarted about a dozen times since yesterday (and reinstalled once) but the download never queues up like it should.

Edit: Got the download to start by verifying integrity of game cache.

What are your update settings? "Always keep this game up to date" Switched to the experimantal without version number? If no, then do it. If yes IDK it should download the 0.13 I have it set on experimental - Experimental version, but I have seen others who have an option for 0.13 also. F...

I have switched to the experimental version and restarted steam, but an update doesn't queue up. I also don't have the option to choose .13 from the Beta dropdown menu. The game still shows version .12.xx when I start it up http://imgur.com/a/Wll3J
What can I do to get the download going?