Verify that you are trying to install the FULL version of ACAD LT MAC 2017.2 (as mentioned above in link) and to your Macintosh HD. Also open Disk Utility and confirm that your Macintosh HD shows "Mac OS Extended (Journaled)".

You should have installed the ACAD LT MAC 2017.2 update first on macOS Sierra 10.12.x then updated to macOS High Sierra 10.13. Otherwise, just download the FULL ACAD LT MAC 2017.2 version and install.