If your computer is connected to the internet you will be able to use the online method of Authorization.1. launch EZdrummer in the stand alone application or as a plugin in your sequencer.2. Enter in your Toontrack account email and password and then click Login and ContinueEZdrummer online authorization3. If you have already registered your serial number to your Toontrack.com account EZdrummer 2 will recognize this and you will only need to click authorize.If you have not yet registered your EZdrummer 2 serial number please type (or paste) in the serial number into the EZDrummer 2 interface and click Authorize.If your computer is not connected to the internet, Please launch EZdrummer 2 and then click the Authorize Offline button.1. Next copy the computer id that appears in EZdrummer 2 by clicking the copy button.2. Access a different computer that is connected to the internet and open a web browser, go to Toontrack.com and login to your Toontrack account.3. Click My Account, then click My Products, then select EZdrummer 2 and click Add Computer4. Paste in the computer id that you copied in step 1. Then enter a computer description. (This can be any name that you choose).5. Click Authorize Product.6. An authorization will then appear. Click the download button at the bottom to download the authorization file. Authorization file7. Save the authorization file to a USB flash drive or any removable storage device.8. Take the USB flash drive that now contains the authorization file and connect it to your offline computer that has EZDrummer 2 installed.9. Launch EZdrummer 2, click the Authorize offline button, and then click the select button and navigate to the location that you saved the Authorization file. EZdrummer 2 will now be authorized.Once EZdrummer 2 has been authorized the downloaded Authorization file can be safely deleted as it is not needed by the program any longer. Saving the file will NOT allow you to authorize EZDrummer 2 on any other computer. Each authorization file is unique to one specific computer.