If you try to open Dragonfly and see this error message:
This is because ome not well-behaved software has placed zlib1.dll in c:\windows\system32, causing a conflict with our version (that sits elsewhere). You can you rename the file in system32 and Dragonfly will start correctly. This may cause the other (ill-behaved) software to not function, but in all cases we've seen so far this didn't happen.
If ever you encounter another software that won't start, you can move the renamed dll to their folder.