Lightroom 5.2 - camera is listed as supported
Camera Raw 9.1.1
Windows 7 64bit
Pentax K50 - just updated to latest firmware
Tried suggestions in Lightroom help
The support that you are reading about is for Lightroom and Camera Raw for raw editing. Unfortunately, there is no tethered support for any Pentax cameras.
Lightroom doesn't support Pentax K50 for tethering support, please refer the below Lightroom blog.