Open project may some times need modification like adding another file(s) deleting file(s), modifying registry entries,adding password,removing password adding dialog information etc.
Once these modifications are done the project file can be saved using 'Save' Button
F4 - shortcut to 'Save' Button.
However,before saving a few things are necessary.
1.Every project should have at least one exe file and this file should be tagged as "#RUN" and only one exe file in the project will be allowed to have this identifier and it stands for running the program after install.However,it is to be noticed that it is not mandatory that the selected .exe file with "#RUN" identifier should run after install is completed and it can very well be skipped also to complete it later on conveniently.Refer to
Installation
Select Files To [ALT+S