I think this question has been already answered before, but I can't find it now.

New in version 7 you have the option to select all the modules you want to install by selecting the checkbox on the left column on the Installed Modules view on Settings menu. Be sure to take away the filter Installed on the search box on the upper right corner (orange box on the image).

Once you select all the modules you want to install, select the option Module Immediate Install (green box on the image) from the combo box displayed on the More button. Here is a screen capture to make things easier.

Thanks I know that, How can I download modules to install them offline ?