Simpler still, do a sync on the device. It will connect to WiFi and download the latest available firmware for your device.
If what you are thinking is "4.19.x was release, I want to update" and you don't get an update over WiFi, that is expected. Kobo release the firmware in stages. They release to a small group for a few days, then expand who gets it over the next few weeks. If you haven't done sync or update for more than a couple of months, you will probably get a 4.18.x firmware today. In a few days time, you will probably get 4.19.x.
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