Double click on the downloaded .dmg file. Once the Finder window pops up, drag the Vapor icon into the Applications folder.
After installing, MacOS may issue a warning that Vapor’s developer cannot be verified when you try to run the application. You will need to right-click the Vapor icon to unlock the “Open” option, after which Vapor can be run as a verified application.
For Ubuntu and CentOS installers, run the downloaded .sh script in a terminal window. It will prompt you as to where the binaries will be installed. For example:
% sh VAPOR3-3.0.0.beta-RH7.sh
Run the downloaded .exe file. A wizard will step you through the installer settings necessary for setup.