Can't find Build in my Genieacs Folder

After installing Genieacs 1.2.4 , i’m not able to find build folder in my Genieacs folder to run build to make changes on the Genieacs server.

What should i do now ?

If you installed it via npm you won’t find the sources. You must clone the git repository if you want to make changes to the source code and build it yourself (see the build from source section here).