Thanks Alfred and Ali - sorry for slow response but am fighting back-up problems at present.

I use Faststone as my photo browser and call Affinity 3 via it using "C:\Program Files\Affinity\Affinity\Affinity.exe" so I guess I installed the MSI/exe version. 

Looking back at AP 2, I used aflaunch.exe so I guess I used MSIX then.  I don't suppose there's a version of aflaunch.exe for Affinity Studio?

Thanks Alfred, I have 3.0.1.3808

I'm puzzled - I get the "New version Available" splash screen on opening Affinity but clicking Download just takes me to their normal  'new user' webpage where I have to decide which version I want.  Not like it used to be...