WINDOWS INSTALLATION GUIDE CAN BE FOUND HERE:
GETTING STARTED - Mac USB Drive Installation
Follow this set of instructions to install Omnisphere 2 from your USB installation drive on to your Mac system.
Note: You need over 64GB of free space available on your hard drive in order to install the instrument.
Omnisphere 2 Installation
Step 1: Connect the Omnisphere installation drive into a USB port. Open the drive "Spectrasonics Omnisphere.url."
Step 2: Double-click the file "Omnisphere 2 Installation.url."
Step 3: Log in to your Spectrasonics user account and select the 'DOWNLOAD' button to download the current installers to your Mac.
Step 4: From your Mac's Downloads folder open the "Omnisphere_2_Installation" folder, then open the "Step 1 - Installer" folder.
Step 5: Open the "Mac" folder inside of "Step 1 - Installer." Double-click "Omnisphere 2 Installer.pkg" to begin the installation of Omnisphere.
Step 6: The installer might need to quit and re-open to ensure support for older versions of OS X, so just click "OK."
Step 7: Follow the steps as you're guided through the installation process. Make sure to review the Installation Info and Licensing FAQ. Then at the "Destination Select" step, choose the option "Install for all Users of this computer." After the Installation Type information you'll enter your system password to start the install process.
Step 8: The plugin files will then be installed on your Mac's system drive.
Step 9: Then at the Preparation step, you'll select where to install the large core library files. By default they will be installed to your system drive or you may choose a secondary drive by selecting the "Choose Location" button.
Step 10: The large data files will now be copied to your selected drive. Allow for 30-60 minutes to install all of the data.
Step 11: After the installation of Step 1 is complete, select "Close."
Step 12: From the Omnisphere_2_Installation folder open the "Step 2 - Data Updater" folder and then open the "Mac" folder.
Step 13: Run the "Omnisphere_Data_Updater.pkg" from inside the "Mac" folder.
Step 14: Follow the default steps of the data updater, making sure that it locates your STEAM folder.
Step 15: When the update has been installed, select "Close." Now it's time to open Omnisphere 2 in your host and authorize it.