Hi Bobby,
You should map the path to your assets accordingly — it should point to the parent folder where the index.xml file is located. The same applies to our bundled presets. The location of these assets, including any paths to custom assets, is defined in the system registry under the following key (accessible via regedit.exe):
HKEY_CURRENT_USER\Software\Itoo Software\Forest Pack Pro\LibraryDir
From the 3ds Max UI, it can be managed from File - Preferences... > Library Browser Options > Library Paths.
I hope that helps.
Best regards,