From the Help menu in MapleSim 2018, select Check for Updates, and follow the instructions. The update software will automatically download the update for MapleSim, as well as any add-on updates you may need.
If that option is dimmed, you can download the update by clicking on the link below.
First install the update to MapleSim. Once that is complete, install the updates for any add-on products you may have, if required.
If you have MapleSim 2018.2, you already have the latest versions of all other add-ons. If you have MapleSim 2018.1, you can use the links below to download and install updates to your MapleSim add-ons. To check your version number, select About MapleSim... from the MapleSim Help menu.