Below are the available downloads for the latest version of Packer (1.4.0). Please download the proper package for your operating system and architecture.
You can find the SHA256 checksums for Packer 1.4.0 online and you can verify the checksums signature file which has been signed using HashiCorp's GPG key. You can also download other versions of Packer from the releases service.
Follow the Install guide once downloaded.
Check out the v1.4.0 CHANGELOG for information on the latest release.