By clicking on "About ReplaceMagic" button you will open form where you can see registration and version status of you copy of ReplaceMagic
Not registered version
Beside registration data you can see also how long is your maintenance period valid (free upgrades). After maitenance period expires you can use ReplaceMagic without any limitations but you cannot download new version.
More information about extension of maintenance period can be found here: https://www.replacemagic.com/ReplaceMagicExtendedMaintenance.aspx