After you open RoasTime, it will check for updates after 30 seconds. If there is a new version that you are opted into, you will receive a notification that there is a new version available.
In the upper left hand corner, you may click
Update after which the release should start downloading to your machine if available.
Right now, there is no notification when new firmware is released. Upon opening the RoasTime, you can click on
Update Firmware which will open a popup with your current version of the firmware.
Check for updates and wait.