I have successfully downloaded MT5 and connected to the demo server. Two points to assist:
- The name field in the Open Account dialogue must be two words, implying first name and surname.
- The compiled help file for MetaEditor is in Russian only at the moment. fai on the mql4 forum has kindly translated it into English using Google Translate. Open up this zip file and copy the contents as mql5.chm into .\MetaTrader 5\help. You may need to be a member of the forum to do this.