Alpha 16 still in early testing and is basically an beta version of the alpha. Expect even more bugs than you are used to, updates could potentially be game breaking during this phase.
If you want to help test it and deal the major issues though you need to enable it on in Steam:
Go to your library
Right click on Stonehearth
Select “Properties” at the bottom
Go to the “Betas” tab at the top of the properties window
Select “latest -Latest build. Minimally Tested”
This should then download the latest test alpha build for you