You can update to Dragon version 15.4 from the following versions:
Use these instructions for the version 15.4 service pack (existing Dragon customers). You do not need to uninstall your previous version of Dragon before installing the new version. The installation process installs your new version automatically.
Do the following to update Dragon.
DPG15DOT4VLA.exe
file to run the installer.Select your language when prompted, and then click OK.
The update wizard opens.
Click Update.
The update process begins.