I had the problem since i started using Win 10 Insider Preview and even after upgrading to Build 10240. So, i wasn't able to download anything from MS Store. Then i found out that changing region from my country (Serbia) to USA can fix the issue, and it really worked. But since today i get the same problem again. Can't download anything from MS Store. Tried using some other region than USA, still the same issue. Anyone got the same issue? Any fix?