Try the attached version. Can't tell when exactly the namespace for this particular line changed.
This section looks now like this.
try:
clr.AddReference("Trimble.Sdk") # new for version 5.50
except:
clr.AddReference("Trimble.Vce.Core")
clr.AddReference("Trimble.Vce.Interfaces")
clr.AddReference("Trimble.DiskIO")
from Trimble.Vce.Core.Components import SnapInAttributeExtension, Project
from Trimble.Vce.Interfaces.SnapIn import IMemberManagement, IName, ISnapIn
from Trimble.Vce.Interfaces.Client import CommandGranularity
from Trimble.Sdk.Interfaces import IFeatureManager
from Trimble.Vce.Interfaces.FeatureCoding import IFeatureCodeManager
from Trimble.Vce.Interfaces.FeatureDefinitions import IFeatureCodeDefinitionContainer, IFeatureDefinitionBlock
Not sure which version you have. There is an older one where you can only view the tree, and a newer one (the attached one) which features a search field, i.e. serial numbers or object names.