You mention that you had "limited internet connection" in your original post. If you mean that you have a slow Internet connection speed like dial-up then the link to the offline definition sets I provided in message # 2 won't be of much use to you since these are very large files (~ 275 MB) and a daily download would not be practical. I don't know of any smaller offline definition set that would work with NIS 21.x (2014) but someone else in the forum might be able to help you with that.
Until a few months ago I used a dial-up connection and one of the things I did to save bandwidth was to turn off Automatic LiveUpdates (Settings | Updates | Automatic LiveUpdate) and run a manual LiveUpdate once a day. There are a few other configuration setting changes I could suggest to save some bandwidth if you think this would be helpful.
------------ MS Windows Vista Home Premium 32-bit SP2 * Firefox 25.0.1 * IE 9.0 * NIS 2013 v. 20.4.0.40 HP Pavilion dv6835ca, Intel Core2Duo CPU T5550 @ 1.83 GHz, 3.0 GB RAM, NVIDIA GeForce 8400M GS