Okay, from the hassles I'm going to presume
jerry12953 installed via the Microsoft Store.
If done that way (as I have) it is more complex - in honesty if Serif supply it via store or indeed on Windows perhaps they should take a moment to look at how people use it and add that function as other plugin\supports do.
Follow the instructions here to gain access to the store apps :
https://www.maketecheasier.com/access-windowsapps-folder-windows-10/
I know all the Mac types will whoop with laughter that its complex, but its a security feature and on the whole users aren't supposed to mess about in there - or do you just press enter a lot until you get root access
Anyway gentle poking out of the way, once you have access you can use the other link I gave you on page one.
For reference my
photo.exe lives in this folder:
C:\Program Files\WindowsApps\SerifEuropeLtd.AffinityPhoto_10602.97.0.0_x64__844sdzfcmm7k0\Program -- I suspect the "
__844sdzfcmm7k0" bit will be different on yours/
I did fire up Lightroom to fully test for you, but the "edit in" option is no longer available to me so could only get as far as setting it as an external editor.
Oh, and the reset option you used if its the one I think it is is basically doing a factory reset on you PC (without loosing docs etc) and is designed for when you;re in real trouble, not just having minor issues.