Modernize macOS setup: binaries, Homebrew, drop Kyng Chaos

[HaoZeke]

Summary

• Remove Kyng Chaos (unmaintained) macOS install path and the broken unidentified-developers link it relied on.
• Recommend CRAN binary installs of sf / terra on macOS (matches current sf README guidance).
• Keep a Homebrew source path using pkg-config + gdal and a correct configure.args.
• Update Windows/macOS R download version strings from 3.x to 4.x.
• Note that Kitematic is archived; prefer the CLI Docker path.

Supersedes #73 (same intent; rebased on current main and aligned with present-day sf docs).

Related

• Supersedes Updated instructions for setup.md #73
• Closes broken setup instruction links #69
• Closes Broken link in mac install instructions  #76
• Closes Kitematic GH repo is archived #77

[github-actions]

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⏱️ Updated at 2026-08-04 10:00:35 +0000