Libyaml is not a requirement, the installer will fallback to a pure python yaml library if libyaml isn't available. It does report a rather confusing error, how

Libyaml is not a requirement, the installer will fallback to a pure python yaml library if libyaml isn't available. It does report a rather confusing error, however, before completing the install. If this wasn't the case for you please shoot me an email at support at backlift.com so I can investigate. Thanks for catching the upgrade/update error.