Hi Cedric,
I answered your question about how to install Cymatic here:
http://www.cymatic.co.uk/forum/topic2028.htmlIf the Betfair server crashes, the software will keep automatically trying to reconnect and will show status/error messages to inform you. If you are particularly concerned about Betfair crashing and are placing very large bets, then perhaps you could keep the website open at the same time, but if both crash then you probably just have to wait, or maybe hedge your exposure on another exchange. In reality, I don't think I have ever chosen to do any of that when trading.
Kind regards,
Gavin