xem in Bithumb $0.301054 but in other exchanges 0.21 cent! why?
Probably a higher demand then there is supply on that particular exchange.
It can also still be the result of the recent hackings and a lack of trust in the exchange / not being able to withdraw certain funds.
The trading on bithumb or other korean exchanges are quite restrictive for non citizen if I remember right. That's why it is mostly some kind of closed eco system. It was nearly the same in the last pump with those exchanges mostly excluded from the price
why is wallet 2.3.0 not available packaged for windows, osx and linux? there's only the web-only version
You can download the universal client by clicking on the link instead of one of the packages for a single OS (I know this is badly done to be honest)