I'm going to try and get this released tonight, but the fix is easy enough.
tk2dMenu.cs, line 4, change to
#if UNITY_4_6 || UNITY_5_0 || UNITY_5_1 || UNITY_5_2 || UNITY_5_3 || UNITY_5_4 || UNITY_5_5 || UNITY_5_6 || UNITY_5_7 || UNITY_5_8 || UNITY_5_9 || UNITY_6_0