Fortunately, the newest version of ConDoc 4.5 will automatically overwrite older versions of ConDoc. All you would need to do is go to your Extension Manager and install the “ConDoc Tools – 4.5.rbz”, then restart SketchUp.
If you wanted to manually delete the ConDoc Folder prior to doing this, it’s totally optional but will not harm anythin. I would delete the whole “ConDoc” folder from your plugins and then follow the above steps (re-install ConDoc 4.5 in SketchUp). This would 100% purge all older versions of ConDoc and drop in the latest folders. All of our reference components, and models are now hosted on the 3D Warehouse; to access these you would just do a general search for “ConDoc 4” in the 3D Warehouse.
Hope that helps,