This implementation of HH in SNAPP was provided by Evyatar Av-Ron <firstname.lastname@example.org>
Download and unzip the zip file into a directory that has no spaces in its path.
Double click on the SNNAP8.jar file (where the 8 might be a different version)
Click on start simulation, then File--> Load simulation and select the hh.smu file.
Finally click on start.