I updated to V3 from V1 yesterday with no problems. Its a little glitchy, so I tried to update to V3b and that wouldn't work because I assume the site was down.
Today (5-4-14) I am trying to upgrade to V3c and all I get is "Failed To Unpack Software"
I have tried fresh downloads of V2 bin, cleared browser cache, using chrome, reset controller etc etc....No Joy.
Is it because the site is down still?

No it is up... upgrading works (but some get Unpack error).