Hi Wout, I purchased a CadLib2 Basic Edition in 2010 and want to evaluate WW.Math 2.0 now using a Trial Edition. I replaced the reference to the WW.dll in CadLib2 by a reference to the WW.dll in WW.Math 2.0 (a reference to a second dll of the same name is not possible). Now an error message pops up when I call a method in CadLib2 (Wrong Licence). What can I do? TIA Franz