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Find the formula for the version you want to install:
- Visit https://github.com/Homebrew/homebrew-core/tree/master/Formula
- Click the file with your formula (e.g. “composer.rb”)
- Click “History” (top right)
- Click the commit hash for the version you want to download
- Click the three dots (top right of diff) and choose “view file”
- Click “Raw” and copy the raw URL from the browser address bar.
For example, composer 1.10.15 lives here: https://github.com/Homebrew/homebrew-core/blob/9e6e6a1ca8551901bff69d329c7fbb9007064134/Formula/composer.rb
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