Can you please give me much more information about the crash problem in Windows 7 in new version NVR Client?? About the UAC settings, the error information/screen shot and so on.
For your question that a NVR Client running on a MAC OS computer, we do have a simple NVR Client running on MAC OS, it only support to connect to our PC Based DVR Server software, and only preview function. Please contact corresponding sales for download links.