Is it possible that this only exist in your country? In Belgium nothing is said about it (news).
No. This malware has hit many countries so being proactive is a good idea.
But I think it's safer to buy the CryptoPrevent? (update... ) Does the malware change everytime of installation folder? or why is this update important?
This is up to you. If you think you are disciplined enough to manually run the update then no need to purchase the paid version. If you would rather it autoupdate then you can purchase the paid version. Malware morphs/changes constantly. The updates ensure that you have the most recent detection logic. So yes sometimes it changes the paths or infection points.
I'm not sure there is a fix described in it?
No. The link you provided was related to the GameOver Zues botnet which was taken down. The CryptoLocker malware heavily relied on this botnet. A new variant named CryptoWall is active however and the CryptoPrevent is one of the best ways to protect yourself. That coupled with safe internet practices obviously.