UniRx had undergone some changes when it supported newer version of unity, and now this one does too, so it should work out the box with latest versions of unirx and unity.
There has also been a couple of new bindings for readonly properties as Unirx has changed ToReactiveProperty to now return an IReadOnlyReactiveProperty not an IReactiveProperty which is what it used to do.
There is also a new binding for game objects that lets you create prefabs as children based on an observable list, which is handy for list based UI components. This can be used like:
myListGameObject.BindChildPrefabsTo(someObservableCollection, somePrefabToUse);