Hello Leigh,
thank you for feedback, but I found a solution to my problem yesterday.
I have requested a refund from You and decided to buy Affinity Designer from Microsoft Store (I wanna check this version). The Program was installed through the Microsoft Store but still didn't start.
At the same time my Windows 10 started to update and there I saw that one update wouldn't install - the update concerned the NET framework 3.5 and 4.8. Then I started looking for info on this topic on the internet.
It turned out that I did not have the NET framework 4.8 in the system (despite the fact that when I checked the system earlier it showed that this version is installed). It was a bug of some old Windows update and I couldn't fix it. I had to reinstall Windows, then the NET framework was updated and the program started working.
For people with a similar problem: manual installation of the NET framework 4.8 doesn't work (the installer will show info that this version is already installed on the system), the NET framework will update to version 4.8 only through Windows Update.
One more thanks for feedback!
Regards,
Bart Wesolek