If Opus 11 is already running (possibly in the background), you'd need to fully exit Opus (via File / Exit Directory Opus) before running Opus 10 from the USB stick, else it would just tell the already-running instance to open a new window.
If Opus 11 is already running (possibly in the background), you'd need to fully exit Opus (via File / Exit Directory Opus) before running Opus 10 from the USB stick, else it would just tell the already-running instance to open a new window.