If the situation is what I wrote to my message subject, I want my money back.
Unfotunately Windows Phone 7.5 is not a supported platform.
You can request a refund from Cleverbridge AG. It is the F-Secure reseller and your partner for all purchases in the store.
You can review the supported platforms on the product page.
Android 4.0 or lateriOS 5 or laterWindows 7 or laterMac OS X 10.7 or later
Sure... I have been in contact with cleverbridge Customer Support: my money (14,49€) hasn't gone to the cleverbridge's bank account, although I got the F-secure Key working. There are 7 messages in our mail chain, with cleverbridge and me. Finally they told me, that they forward my messages (WITH FILE ATTATCHMENTS AS SCREENSHOTS FROM F-SECURE'S RECEIPT AND MY BANK INTERNET ACCOUNT'S REVEIPT) from F-secure Key purchase back to F-secure customer support, but nothing has been heard from there. So, I propably have been lost my money and F-secure keeps charging my bank account every year (which was in the agreement when I paid my software purchase.)
Maybe I get some justice from here??
And, of course, when I wrote that "although I got the F-secure Key working" I meant my Windows 7 computer operating system - not my Windows 7.5 mobile phone operating system.