Hi Josh,
1. 2.05 is just a maintenance release in respect to 2.0 (we always suggest to use the latest release). Some new issues has been added regarding the import feature and the outline calculation procedure, you can find a description of them at
http://www.aboutarchiterra.com in the FAQ area.
2. what do you mean by saying “enter constraints using a x,xx format”?
3. to share your file you should follow this procedure:
a. display the ArchiTerra References component list
b. here you will find the external references file you should attach to your library to correctly display the terrain
c. all these macros are contained inside the ArchiTerra 20.Lib folder that is located in the same folder as the ArchiTerra 2.0 plug-in
4. "group operation error @ line 48 of file …", send me the file and I will check it (BTW, which version of ArchiCAD are you using?)