If you need to install an older version of the software, you must first uninstall or remove the current version that you have.
For Windows, you can uninstall the software through the Control Panel.
For Mac OSX 10.4 (Tiger) and 10.5 (Leopard):
Open a Terminal (Applications : Utilities : Terminal)
Run this command: sudo rm "/Library/Receipts/Dragon*"
For Mac OSX 10.6 (Snow Leopard) and newer:
Open a Terminal (Applications : Utilities : Terminal)
Run this command: sudo rm /var/db/receipts/com.dzed.*
Then you will be able to install an older version of the software.
You can find previous versions on our Downloads page.