Google recently made their suite available for free and I found how to open files with HDR Efex Pro 2. I get to tweak parameters until it looks a certain way and hit Save. A scrollbar appears, progresses to the end and closes. No success or error message is shown.
Now, where is the output? Cant find it anywhere. Nothing appears on the Desktop, Image, Documents, TMP or TEMP folders. This is on Windows 7 64-bit using the 32-bit or 64-bit executables.