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This question already has an answer here:
- Installing Bootstrap 4 with bower 4 answers
The v4-alpha documentation states
Bootstrap v4.0.0-alpha is available for download in several ways, including some of your favorite package managers.
however, the mentioned
bower install bootstrap
installs the latest stable release 3.3.5 instead.
How to install v4 alpha using bower?
To install a specific version, append the GitHub tag using #:
Adding "bootstrap": "4.0" to the bower.json file under dependencies and running bower install in the terminal did it for me. Naturally, if you're using Yeoman and opt-in for the Bootstrap option, you'll want to remove the bootstrap folder under the bower_components folder.