I repeatedly get "unknown error (4)" when try to download upgrades

Yes, that could be the problem.

Quit the App Store if it's open.

Try "resetting" your Apple ID password > My Apple ID

When you're done open the App store and try updates

I am also having problems downloading updates in the Mac App Store. It is showing the error (Hash mismatch).

I'm also having this issue. This is a used laptop, so all the apps have been downloaded with a different Apple ID if that matters. I tried resetting my account and am running lion.

I started getting this "unknown error" tonight trying to download updates to four apps on my iPhone 4. I followed "retry" instructions to change my password two times now, to no avail. Anyways, I've had this same password since Gawd knows when - now it's no good?

And, yes, I updated my iCloud, Store and other settings to be the new password. Two times now.

No problem getting into the Apple Store and iTunes.

But still can't update from App Store.

What gives? All these snafus since iCloud are getting old.

Same problem !!!

I am also having this problem only in the Mac App store... my iPhone updates just fine. But I've had 2 apps on my mac that I've been trying to update for well over a week, and keep getting the "unknown error (4)" I have already recently reset my Apple password... Apple actually made me change it very recently... and everything works fine on my iPhone, and I can sign into my Apple account just fine on my mac... it's only when trying to update in the Mac App store.

I have closed the app store program completely and re-started, that does nothing. I hated already resetting my password once because I had one I preferred to use that's easy to do quickly for me on my iphone, and they made me change it to something more complicated... I don't want to have to change it again just for this, that would be ridiculous anyway and should have nothing to do with this error, especially since they JUST made me change it like a month ago and since that new password works fine everywhere else within Apple! Closing/resetting the app store does nothing, my recent password does nothing... nothing makes sense with this error! What the heck is going on?? It's bad enough here on my mac, I can only pray it doesn't start acting up on my iphone also, that would really tick me off!

I just wish they would get this figured out and fixed ASAP!!!

I have exactly the same issue. This issue is preventing me from updating to Lion as well as updating other apps. Very frustrating given that I can access the iTunes store without any problem from both my computer and iPhone.

yup - same here.

(~_~;)

same problem here! I've restart my Mac Mini, reset the password. Come on! we are using a Mac! that kind of problems can't happen!!!!

。・゜・(ノД`)・゜・。

how do you get them to change it to a new id for you because im having the same problem

Hey why don't you try this "settings > store > sign out your Apple ID then sign in again " Hope this helps. 🙂

Hey ,first you have to update your mac os from software update! and you wont get this error again! 😉

Koshiars... really??? Do you really think all the thousands of people that have this error haven't tried that insanely simple task? I've done ALL my software updates, many, many of them over the last few months... doesn't change this ridiculous, never-ending error at all!

And to Ryanfabian... I'm sure others have as well, but for sure I have signed out and back in... over & over & over... and again it does nothing!

Since so many people have this problem, it's obviously an issue on Apple's end, an issue they seem to be ignoring for some reason! I finally gave up and deleted the Mac App store altogether, too much hassle! Making me start to question Apple in general!!

I fixed it all you have to do is backup your phone than restore it to manufacture settings than restoring it I tried signing in and out that doesn't work