Your mac download appears to be broken. Downloads as loadjitsu-mac-0.0.2 but my Mac doesn't know what to do with it. Tried appending .dmg and .zip with no luck. Excited to try out the app when it's fixed :)
Hey thanks for reporting this.
It is a single go binary
Please do the following after you have downloaded
1. chmod +x loadjitsu-mac-.0.0.2
2. ./loadjitsu-mac-0.0.2 server
This should start the load testing server