Versioned macOS ZIP download URLs return 403 (breaks Homebrew installs)

[iamrajiv]

Issue

The versioned macOS ZIP download URLs used by Homebrew return 403 Forbidden, breaking installs and upgrades.

Example

https://prerelease.keybase.io/darwin-updates/Keybase-.zip

Working alternative

• https://prerelease.keybase.io/Keybase.dmg
• https://prerelease.keybase.io/Keybase-arm64.dmg

Impact

Homebrew users cannot install or upgrade Keybase.

Is this temporary, or is there a recommended long-term URL for package managers?