I have just downloaded and installed the BlueTools SDK v1.21 on my Windows XP SP2. I have a bluetooth dongle using the WidComm stack.
When I build and run the demo FindAndConnect (dotNet200) it works but of course no devices are found. When I add the following line so I can use WidComm:
Manager.StackID = StackID.STACK_WIDCOMM;
manager = Manager.GetManager();
and run the application again, I get the error
"BlueTools.dll not installed. Please visit franson.com/bluetools for more info"
(By the way I did copy all the bluetooth.dll files from Windows\system32 to the sample's Debug\bin directory).