WLED web installer stuck on "Preparing installation"

I was able to successfully update 1 WLED controller using the new update feature in HA 2022.4.0. But 1 controller did not update. It rebooted, dropped off the network, and only lit up the first led to white. I connected the ESP to my laptop and am trying to reflash the board. However, the web installer is stuck on the Preparing installation dialogue. I pulled this board off after about 20 mins, and tried another brand new ESP, and have the same issue. Any ideas to resolve this?

Are you connecting GPIO0 to ground to get into flash mode?

I was just using the web installer, install.wled.me. This caused the issue above.
I have been able to install the bin using the ESP flash tools app successfully.
I just wanted to report the web install issue somewhere.