Which version of archi-lab did you install?
You can also get link Documents by using few lines of python:
import clr
clr.AddReference("RevitAPI")
from Autodesk.Revit.DB import*
clr.AddReference("RevitServices")
from RevitServices.Persistence import DocumentManager
doc=DocumentManager.Instance.CurrentDBDocument
link_inst=FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_RvtLinks).WhereElementIsNotElementType()
linkDoc, linkName = [], []
for i in link_inst:
linkDoc.append(i.GetLinkDocument())
linkName.append(i.Name)
OUT=link_inst,linkDoc,linkName
