Thanks Ignacio. Yes, that was the same link I was using before. I got this message:
Your OpenGoo: The Open Suite download will start shortly…
but it would never begin. It was using the Softlayer mirror in Plano, Texas (which is closest to me) but I just now switched it to the Voxel mirror in New York and it finally began downloading.
As for the ZIP extension in PHP, I've always done the automatic upgrade and never encountered this problem before.
Oh well, I have just managed to download the file and I'll try a manual upgrade