Greywizard

As I said, uninstalling the older version and then installing 1.8 from scratch worked for me. I tried Walt's method, but it didn't work, both the rebooting and running as administrator (in that order). It's worth noting that, when I first tried to install Photo, Photo was running, and the installer offered to shut it down for me, but then, once it was shut down, setup failed. So, at least for me, the installer was clever enough to recognise the programme as running, and shut it down. I didn't try Andriko's method, which sounds quite complex, and it is surprising that it worked (a bit like doing a sacred dance, though a very clever one), but it may contain a clue as to what is wrong when it doesn't install. Anyway, it's good to know that there are work-arounds for it, and good to see, too, that everyone is so helpful when problems arise.

Hi Callum, Problem solved in a roundabout way. I uninstalled each programme and then installed the new 1.8 updater with no problem. A bit of a nuisance, but it worked! Thanks. I assume the log files you ask for will reflect this fact. If not, of course I can send whatever you need. Best, Greywizard

I have tried to install Affinity Photo, Affinity Designer, and Affinity Publisher 1.8, and each time the message 'Setup failed" has been returned. Any suggestions?