If you wish to perform the Field setup fully offline, it is possible to pre-download the required SQL Express version and install it from a USB stick. This removes the need to download a large file when out in the field.
The process is quick and easy, simply download SQL Express (download here) and place it on a removable USB drive. When you are ready to go into offline mode in OFS, simply plug the USB drive into the computer, start OFS and click the “Work Offline” button. OFS will then find the file on your USB drive and use that to complete the setup.