I've taken note of the key and text you provided. The key is 'free for mac download USB Device Tree Viewer 3.8.9'. I noticed that the text provides information about the USB Device Tree Viewer, a small application designed to display detailed information on the USB device tree.

Based on the text, here are some points that caught my attention:

* The USB Device Tree Viewer is available for free download.

* It can be downloaded for Mac devices.

* The software displays information for all USB hubs and ports, including connection status, device information, and relative connection information.

* MajorGeeks provides this utility.

* There is a bug fix in the latest version (3.8.9) of the software.

Additionally, I noticed that there are other topics mentioned in the text, such as:

* The easyDCP Player manual

* McAfee Stinger 12.2.0.65 Portable

* System Information Utilities

* MobaXTerm software with a ssh client

* MAC encryption

* VP-794 device with USB port

* PC connection

If you have any specific questions or need further assistance related to these topics, feel free to ask!

Free for mac download USB Device Tree Viewer 3.8.9