This is the current state of our software for 3ds Max 2016:
Our latest releases of Forest Pack (Forest Pack Lite/Pro 4.3) & RailClone (RailClone Lite/Pro 2.4) could be installed on Max 2016 through the Advanced Installation, using the Max 2015 option and selecting the 2016 path (as shown on attached screenshots).
Please note this configuration is not officially supported, since the plugins are not compiled with the Max 2016 libraries. We'll release the final versions once V-Ray for Max 2016 will be available.
Free plugins (Clone, Glue and ColorEdge) can be used in Max 2016, just copying the .dlo for Max 2015 in the "plugins" folder.