The license can be placed to its default location, or you have to set where to look for the license.
The default location is
<User_home>/chemaxon (on Windows) and
<User_home>/.chemaxon on Unix-like systems.
License file can also be set by CHEMAXON_LICENSE_URL environment variable, or by the chemaxon.license.url JVM parameter.
Please note that Marvin JS license installation is different, the installation guide will be sent to you together with the license.