I have been waiting for two days the synchronization of its blockchain never finishes. wtf is wrong with this?
Also after I download the latest stable version, whenever I start the myst, it asks there is a newer version to download.
wtf?
It's just how it works right now. Ethereum blockchain is pretty big and it took me around 3 imcomplete days of syncing in order to fully sync my ethereum wallet and get it started. Pretty tiresome process and involves a lot of waiting, i know.
If you're just looking for a quick way to get started, use MEW or Exodus.
Both lets you retain control over your own private keys without having to run a full node.
