I have never used Samsung's websites to update my Samsung devices, and I have 4 currently, and about 8 in total (have sold or returned the other 4). The wonderful devs and users on this forum are very helpful, they have way more knowledge than Samsung's website, and they are more than help to lend a helping hand.
Don't worry about your current android version, the new Tizen can be upgraded from any Android version. Iike I said before, I'd recommend using ODIN instead of Kies. Check other threads in this forum, there are ones that discuss how to upgrade to Tizen with ODIN. The thing I do suggest is to make sure you read and understand the instructions before trying.