[Albert]

I confirm the new driver for Leica laser trackers we provide by default is not be compatible with older Leica trackers such as the LTD 800.

You should follow these steps if you want to use an older version of the driver:

1. With RoboDK open, close all RoboDK side/docked windows
   
2. Select Ctrl+Alt+Shift+G and select Yes to enter in Developer mode
   
3. Select Tools-Connect Leica laser tracker
   
4. Select More Options
   
5. 输入新的司机帕特h (for example, /api/Leica/apiTrackerLeica-v0.exe)
   

This setting should be saved with your RDK project so you don't need to follow these steps every time you connect to your Leica laser tracker.