How can I create Installer for a lot of computer in network synchronously ?

You can create a service that will run on client machines as well as on ONE server where your new installer will be stored. Every morning or whatever time you want the client service to run, it will compare the current version on the client machine and the server machine. If server version is newer, it will download and install the installer.

You can also put this functionality in the application start-up but that may slow down the application start-up.