All you need to install your e-Sword LT module at no additional cost is to enter your Email address and "Product Key" you received when you purchased the module for use with e-Sword. If you do not have that information, just tap on the "Recover Product Key" button on the popover that prompts for this information.
No. E-Sword LT is an "offline" app. An Internet connection is only needed for downloading the app itself, and any additional modules you wish to install.
Yes. We tested on all iPhone models running at least iOS 5.1 which is available for all generations of iPhones.
Yes, but only the iPod Touch running at least iOS 5.1 which is available for 4th and 5th generations of the iPod Touch.