All versions of Caddie from Version 10
How can I save a drawiing in a different version of DWG?
With the drawing open, go to MENU>FILE>SAVE AS or MENU>SAVE OTHER> SAVE COPY (Ctrl+F2)
In the dialogue that has opened, select the DWG version displayed, and a drop down list will display all the versions that can be saved. Choose the required one.
Note: if the drawing contains any AEC objects and is Caddie 17 or later (2010 / 2011), saving to earlier DWG versons will require saving the AEC objects as "Proxy Objects". This is true for Caddie users or other DWG users.
This is done in MENU>SETTINGS>DRAWING DEFAULTS.
Select either of the two options shown in the box with the red line as shown below.