What do I need do run MayaToMantra?Well as the name implies, you will need maya and mantra. The good thing about mantra is that you will get at least one free version with every houdini installation, even with the free apprentice version. If you need it, see at sidefx.com for more information.
The plugin will rely on the system environment variable called "H". This variable should point to the current houdini installation. Lets imagine that you have installed houdini in:
C:\Program Files\Side Effects Software\Houdini 11.0.446.7
Then the envionment variable should be set like this:
set H=C:\Program Files\Side Effects Software\Houdini 11.0.446.7
You can do so in your computer settings or in the maya.env file. There the line is the same without the "set":
H=C:\Program Files\Side Effects Software\Houdini 11.0.446.7