I run Windows 10 Version 2004 (OS Build 19041.388)
If I try to download the 1.84 Photo Update file I get this screen
This app might harm your device
Microsoft Defender SmartScreen reported that this app is not commonly downloaded; you should only open files you trust.
Name: affinity-photo-1.8.4.exe
Publisher: GB, Nottingham, Serif (Europe) Ltd, Serif (Europe) Ltd, Nottinghamshire
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Delete
It also suggested that I delete the file as was too dangerous to have on my PC.
I have used your products for a long time and so having checked URLs etc I decided that it would be safe
I have flagged it as a safe product, but perhaps you need to get in touch with Microsoft about this.