You can update your Memberium to our latest release by going to your WordPress admin screen->Plugins and searching for Memberium and hitting update.
Alternatively, you can update your Memberium to our latest beta from Memberium -> Support -> Updates tab -> Memberium Manual Updater and selecting the very latest version from the dropdown.
While updating to our latest version, you’d need to make sure that you check “confirm update” before hitting save options to complete the update process.