I believe that the link to the current PYNQ image for the RFSoC 4x2 board is down for both v3.0 and v2.7. Both will not initiate a image download and instead bring me to an error page.
Sorry about this. I just checked and I see the same issue with some of the links.
It looks like they are (temporarily) down. We are checking this and will try get it fixed and report back. They may come back online so you might want to try later.