If you see only a blank blue screen when opening the Offshore App, such as below, please try turning off your Antivirus software, e.g. McAfee or Malware Bytes, or uninstalling it.
Please disable or uninstall your VPN if this doesn't resolve your issue.
Failing that, please upgrade your operating system to the latest version your computer will support e.g. Windows 11 or latest Mac O/S. For Mac, please see the links below for the list of most recent O/S your Mac will support and link to the App Store to download it:
What operating system version your Mac can support