$ curl -LO https://core.sensuapp.com/osx-unstable/sensu-0.22.0-1.pkg
You can find a link to the latest package here: https://sensuapp.org/download
Verify checksum via https://sensuapp.org/SHAsums.txt
$ shasum -a 1 sensu-0.22.0-1.pkg | grep 3af3e6a3ad1596371786e3015706d8d1c68cfbad
3af3e6a3ad1596371786e3015706d8d1c68cfbad sensu-0.22.0-1.pkg
Alternately you can double click the pkg file and click through.
$ sudo installer -pkg sensu-0.22.0-1.pkg -target /
installer: Package name is sensu-0.22.0-1
installer: Installing at base path /
installer: The install was successful.
$ ls -la /opt/sensu/bin/
total 32
drwxr-xr-x 6 root wheel 204 Mar 15 11:01 .
drwxr-xr-x 4 root wheel 136 Mar 15 11:01 ..
lrwxr-xr-x 1 root wheel 25 Mar 15 11:01 sensu-api -> ../embedded/bin/sensu-api
lrwxr-xr-x 1 root wheel 28 Mar 15 11:01 sensu-client -> ../embedded/bin/sensu-client
-rwxr-xr-x 1 root wheel 83 Feb 25 22:16 sensu-install
lrwxr-xr-x 1 root wheel 28 Mar 15 11:01 sensu-server -> ../embedded/bin/sensu-server
$ ls -la /etc/sensu/
total 0
drwxr-xr-x 5 _sensu _sensu 170 Mar 15 11:01 .
drwxr-xr-x 89 root wheel 3026 Mar 15 11:01 ..
drwxr-xr-x 2 _sensu _sensu 68 Mar 15 11:01 conf.d
drwxr-xr-x 2 _sensu _sensu 68 Mar 15 11:01 extensions
drwxr-xr-x 2 _sensu _sensu 68 Mar 15 11:01 plugins
Dropping off required /etc/sensu/config.json, and any other required configuration, certificates, etc. is left as an exercise for the reader.
sudo launchctl load -w /opt/sensu/embedded/Cellar/sensu/0.22.0/Library/LaunchDaemons/org.sensuapp.sensu-client.plist
Compare with: http://f6c6db7d.ngrok.io/docs/0.22/sensu-on-mac-os-x