Download the Maple18MacInstaller.dmg file from Software Repository.

Instructions created by Bryan S. Lee 2014 (bl@clemson.edu)

for CCIT, Clemson University

smb://software.clemson.edu/software/Maple/Mac/Maple18/Maple18MacInstaller.dmg

Open the Maple18MacInstaller.dmg file. Then run the Maple 18 installer that is contained within it.
Authenticate with your Mac Administrative password.
At the "Introduction" screen, click "Next".
Toggle the "I accept the terms of the License Agreement" radio button and click "Next".
Do not change the default installation folder unless absolutely necessary. Click "Next".
Select "Yes" or "No" when prompted about the desktop shortcut. Your choice.
Select "Network license" when prompted.
Select “Single Server” when prompted.
When prompted for the License server address, enter "license6.clemson.edu" (without the quotes). The Port number should be set to 28014. Click "Next".
When installation is complete, click "Done".