They need to exist at the end of the year to get the prize money. So far they have just confirmed their entry into the 2015 season, the 2014 money doesn't appear until December.
This article suggests they already got $10M for turning up and committing to the 2015 season:
http://adamcooperf1.com/2015/03/15/could-manor-be-in-big-trouble-with-ecclestone/
It’s understood that Ecclestone is not happy with the fact that Manor did not take to the track after presumably committing to participating in all the races as part of the process that led to the team getting a place on the entry list. That also led to the team getting a £6.52 ($10)m payment as the first stage of its prize fund, and Bernie may now feel that the team has not kept up its side of the bargain.