You could pick up a cheap PAYG SIM on another network, assuming your phone is not network-locked. O2 (used by Giffgaff & Tesco) has been used by others here to workaround the unexplained (HMD, the lack of communication is inexcusable, even if the constipation is inside EE) blockage on EE. Temporarily swapping the SIM, downloading the update, then swapping back may be the pragmatic solution. N.B. forcing an update could potentially cause trouble, if the network has blocked it for a reason (the second half of why silence is inexcusable, HMD).