After recent Mac OSX 10.10 update, virtual driver (the "Install driver" button at Streamer-> Settings tab) can not be loaded normally; however, virtual driver is a must need to make Extended Wireless Display product work on a Mac.
Here is the workaround for Mac OS 10.10 Yosemite user which could let you enter developer mode to load virtual driver:
- Open Terminal app on your Mac and run command: sudo nvram boot-args="kext-dev-mode=1" (It might need your admin's password at this step.)
- Reboot your Mac.
- Go to Streamer-> Settings tab to hit "Install driver" button, then reboot again.
- Open Extended Wireless Display app to establish connection to your Mac to see if it could work.
If it still does not work, please go to System Preference-> Display to see if system detects extend display after above workaround done, if not, please reboot again then establish session.