RE:zena.rtYou can still purchase rights but I would check with your brokerage how much time they need to exercise the rights. I've heard some people say their brokerage could require up to a weeks notice and anything less than that will be done on a best efforts basis depending on how many people have waited until the last days.
Moving into next week, holding rights could be like playing a game of musical chairs. You don't want to be the one holding them when the music stops.
If your intention is to exercise the rights to buy the shares, it is easier just to buy shares, at the current price of rights $0.035 and shares at $0.2025 it works out exactly the same.