Iso size will be around 2.5 GB but after grade to Win 10 it will download monthly update so it will cost few hundred MB more so it will be enough with 3.4
Better download ISO using media tool than upgrade via win update as if for some reason windows update failed then you will lost all download, you hv to again start from beginning.
Start download from 10 pm night so that you can get benefit of both today and tomorrow(after 12 am night) data quota
Better download ISO using media tool than upgrade via win update as if for some reason windows update failed then you will lost all download, you hv to again start from beginning.
Start download from 10 pm night so that you can get benefit of both today and tomorrow(after 12 am night) data quota