I don’t know why you never got a response. I have the same issues. Today I am trying to install Studio Code.
Logger: homeassistant.components.hassio
Source: components/hassio/websocket_api.py:135
integration: Home Assistant Supervisor (documentation, issues)
First occurred: November 29, 2024 at 7:33:33 PM (3 occurrences)
Last logged: 6:48:55 AM
I have had similar problems with other add-ons, and in fact with the initial setup of HA.
I don’t know if my ISP is to blame but I have been finding that if I take my device to work connect it to their network, I can complete these tasks without error.
I don’t have any fancy firewall in my home, just a router in vanilla configuration. But it almost seems like HA uses some unusual protocols or ports and the download gets blocked by some firewall.