how many users of Freebitco.in that are also members of the forum have won the first prize in the weekly lottery.
It's impossible to answer this question. There is no way to know who has won the lottery. You can only know the user IDs. Even if a user of the forum wins the lottery, due to privacy reasons, he/she may not reveal that.
.Second I don't see any option to download any ticket list in their website so care to enlighten me further about this?
Every week, the list of all user IDs and number of their tickets is published through their
twitter account.