Can't download due to fetch failed

This is when using the 0.3.0 release.

Here are the logs:

```
2026-02-23 10:39:06.621 [info] Checking for stable updates...
2026-02-23 10:39:06.712 [info] Latest stable release is tagged "v0.1.0-rc.1", published at 2026-02-22T17:04:58Z
2026-02-23 10:39:06.714 [info] Downloading stable release v0.1.0-rc.1...
2026-02-23 10:39:06.783 [error] Failed to connect to GitHub to download expert_darwin_arm64 from https://api.github.com/repos/elixir-lang/expert/releases/assets/360272601: fetch failed
2026-02-23 10:39:06.784 [error] An unexpected error occurred checking for updates: Failed to download expert_darwin_arm64: fetch failed
```

I don't believe this is a GitHub issue since unauthenticated GitHub downloads work fine elsewhere. The URL in the logs works fine for me in Firefox and via curl.

I did have a previous issue, #21, where the wrong binary type had been downloaded. I don't know if there's anything left over from that. It seems kind of strange that it would manifest as a "fetch failed" error.

Is there any additional debug information I can post?