Download the Windows or Linux OAS installation here.
To upgrade an existing system go to Configure-Options-License and select Update Version.
First download the OAS Platform.
For Windows next uninstall Open Automation Software using Add / Remove Programs from the Control Panel. Run the new setup and start the 3 OAS Services.
For Linux simply copy in the extracted files to the OAS Engine directory.
Do not delete the installation directory, options, or license files and all configuration data will remain.