Our apologies for the confusion. Currently, the only Bosch distance meter supported is the GLM 100C, in legacy versions of OrthoGraph.
Support for Bosch GLM distance meters (including the 50C) in OrthoGraph I will be implemented in January. Support for Bosch PLR devices is projected for February.
More information on current distance meter support can be found here:
Également BOSCH PLR 30 C