Which version to install and username question


So, I just bought my very first Xenforo license! Yea!

Question, should I download the latest version? As in, are all upgrades and new themes and extras working ok with the new latest version or should I choose an older version to avoid any bugs or mishaps?

also, I meant to post this in the current customer area and have added my username to my account, but it still wont let me post there?