Supply a "name" and an email addy (a throw-away is fine) and you'll get an email with an activation key and a download link.
Got the link from a recent Graham Houghton newsletter (Week ending October 3, 2020 (https://www.grahamhoughton.com/newsletter-pdf/)). This particular newsletter has a simple but useful modification to charger used by most Panasonic Lumix bridge cameras. The mod requires soldering two connections and a "3 digit LED voltmeter (less than £2 on Amazon)".
It also has a good summary of how to use the exposure controls of most digital cameras.
Aurora HDR 2018 software (https://skylum.com/l/ap-aurora)
Free is always a nice price! :thumbup: