I got a warning message saying my spine-unity runtime was not up to date with my editor so I downloaded the latest runtimes and imported them.
Now, my project is chock-full of errors. Almost everything spine related has errors - even the example scripts.
EDIT: I deleted all of the examples and mostly everything works now. However - TrackEntry.Time does not seem to exist anymore. What is the new implementation of this? The change is not reflected in the documentation.