Mac OSX: 

It is possible to install Atmosphere and Trilogy on a new system using their existing sound database files called Atmosphere.dat (3.7 GB) and Trilogy.dat (3.0 GB) from a previous installation. To do this you need to know the location of these database files and move them to your desired destination. They can be on your primary or a secondary internal or external hard drive. Once you have the .dat files situated, download the appropriate plugin updater for Atmosphere and/or Trilogy (i.e. VST, Audio Units, RTAS) log in to your User Account to get the updates. 

Run the update installer after the download is complete. Now navigate to the location of the Atmosphere.dat and/or Trilogy.dat and create an alias of the file(s). Do this by holding down 'COMMAND' ('APPLE') and 'OPTION' then click on the .dat file and drag it to your desktop. If you have done this correctly it will only create an alias and will not copy over the .dat file. Put the alias in this location: 

For VST (i.e. Cubase, Nuendo): 

    Macintosh HD/Library/Audio/Plug-Ins/VST 

For Audio Units (i.e. Logic, Digital Performer, GarageBand): 

     Macintosh HD/Library/Audio/Plug-Ins/Components 

For RTAS (i.e. Pro Tools): 

     Macintosh HD/Library/Application Support/Digidesign/Plug-ins 

You will have to authorize the plugin again and can do so by logging into your User Account.

 
Windows: 

Although it is possible to use your existing .dat files on a new Windows system it is a difficult process since it involves registry manipulation. It is recommended that you do a new install from your original Atmosphere and/or Trilogy discs.