@groberts Photo was purchased from microsoft store, had to load the store app and sign in, from my list of software (not much) found Affinity Photo and 'store' ran the update (no key number with store). Was then able to launch photo from store window and nice to see version 1.9.0.932, I expect it would have happened automatically quite soon, has in the past. Once opened Affinity gave me the option of registering the software.
Designer I have from Serif Affinity, downloaded and installed/updated to V1.9 was then asked for key before I could use. I did download Photo from Affinity site but had to go via microsoft store.
So a difference depending on supplier. So from the store app three dots top right gives Downloads and Updates.