A method comprises: in response to receiving a file identification of a first file in an application to be installed in a computing device, sending the file identification to a file server, wherein the first file belongs to a first file group of the application, and the first file group is a part of a file set of the application. The method further comprises: in response to receiving a first file group identification of the first file group from the file server, acquiring the first file group based on the first file group identification. The method further comprises: installing the application based on at least the first file group and a second file group of the application, wherein the second file group is another part of the file set of the application.