And now I remember again why over ten years ago I stopped to buy from matrix store any longer - their shop software works worse than sh!+. Impossible to alter the old and outdated email adress in my old account, cannot log into that special subpage of my profile needed for that, and do not get email links as instructions promise, tried with security off, cookies on, three different browsers, two diffrent machines, addblockers and other addons paused and turned off. It was like this already 10, 12, 15 years ago, and obviously they have learned nothing in that time.
Will wait some more months into 2025 and then buy via Steam. That way the game developer looses money, well, his problem, not mine.
Idiots. But hey, if you dont need money and are too lazy to secure deals, then nothing's wrong in pissing off potential customers.
Auf Nimmerwiedersehen, ihr Deppen! 
What you haven't learned in the last 12 years, you likely will not learn in the next 12 years either.