Both are not installed in the screen shot. I simply created a 3.06 folder in the Mods folder. When I want to use 3.06, I uninstall 4.02 first, vise versa.
I took the contents of the 3.06 installation, and put them into the 3.06 folder Icreated within the Mods folder,
Here is a zip file I created of the 3.06 files without the exe procedure.
http://www.jf18-resource.com/Utilities/TSH_v3-06_Full.zip