Here's the link to download AutoCAD LT for Mac 2013 Service Pack 2:
http://usa.autodesk.com/getdoc/id=DL22617033
And here is the instructions on how to install this on top of the AutoCAD LT for Mac 2013:
This update can be patched directly on AutoCAD LT 2013 for Mac SP1 standalone version(not applicable for the LT downloaded from Mac App Store). Follow these instructions to install this Service Pack.
- Close all applications before you begin to install the update.
- Double-click AutoCADLT2013SP2.dmg to mount the volume.
- Double-click AutoCADLT2013SP1.pkg in the new mounted volume to run the installer.
- Follow the on-screen instructions.
- Launch AutoCAD LT for Mac after the installation has completed.
- At the command prompt, type _vernum and press Enter to verify the update was installed. The version number should be "G055.M.208".
Note: AutoCAD LT 2013 downloaded from Mac App Store needs to get the update via the App Store.