2. Why there is a miner to download, when it is 100% PoS?
3. Is buying 1000 XEL the only way to earn more coins?
4. Where is the elastic computer in all that?
I am a bit surprised that you are asking these kind of questions. Obviously, you have neither read the whitepaper nor did you take even a quick look at the website. The information you are looking for is all there!
It's so sad, it's funny.
It's like a year back, when people genuinely, unironically asked in PoW coin threads "
but how do I get tokens if you don't do an ICO?"
Now it's that plus masternodes, I guess. Give EOS, TRX and so on a bit more time to attract even more flies and it will be DPoS "how do I vote to get more tokens" galore.