Hi Steve,

> I assume once the trial expires, MoI will ask me for a new licence key

No, the trial version and the full version are separate. When you receive your new version license key in e-mail along with it will be a download link for the full version. You'll need to download the full version and uninstall the trial.

When you run the full version the first time it will ask you for your v4 license key.

- Michael