MAC

To install Comet simply open the installer package Comet-<version>-INTEL-EVAL.mpkg or Comet-<version>-INTEL-FULL.mpkg. This will walk you through the installation, letting you choose the installation location. Once you have installed COMET, the application can be found under

/Applications/Comet
on your harddrive. The installer also adds frameworks in the sytem wide framework folder. COMET can be used from the Studio application or from the command line. It is advisable to leave COMET at its default location and not move the application bundle around.
Installing your license file

The license file you receive by email should be copied under /Library/Frameworks/Comet.framework/Resources and you should use the name license.col. You will need your administrator password to copy the file in place. Once the file is installed the development Studio will display your license in the "About" box.
Command Line

You can easily run COMET at the command line. For convenience, the installation includes the scripts comet32 and comet64 that run /Applications/Comet/comet.app/Contents/MacOS/comet in 32 and 64 bit modes respectively. There is also a script comet that just delegates to comet32.

For instance, if you have a file foo.co you wish to run, simply type
/Applications/Comet/comet foo.co
and COMET will run the model (with the jit enabled) and print all the results on the standard output. Naturally, you can modify your PATH environment variable to reflect the correct location of the scripts (namely /Applications/Comet).