On Windows 10, the window below may appear. This is perfectly fine, click on the “Run Anyway” button. If the “Run Anyway” button is not visible, click “More Info” and then the button should appear.
If you have already created a project, then you can click on “Open Project”, then click on the button with the three dots to open the file explorer. Within the file explorer, you can click on the existing project’s project file (with the OBCONFIG file extension) and click the Open button. This will open the existing project and allow the user to continue their work.