Can't update my iMac to 10.7.4, every method says file is corrupt.

I have had the EXACT same problem and done the EXACT same things as you man. Only I use a MacBook Pro. I am thinking that we should wait a bit until the servers and Mac people have fixed the problem... But if anyone can help out then that would be awesome.

I'm having the same issues on my MacBook Pro. I've been trying to download this update for the last two days. I'll give it a shot again today and hopefully the servers are clear and the files don't turn up with the "corrupt" notice.

jdotmattinson is correct! I have the same issue.

It is a router/ISP issue. Tried the software update drop down for 10.7.4, failed. Tried to download 10.7.4 Combo Client update, invalid checksum. Tried to download 10.7.3 Combo client update, invalid checksum.

Went over to Win7 Dell laptop, downloaded 10.7.4 Combo update, transferred to MacMini via USB drive. Invalid checksum. WHICH led me to diagnose it wasn't my Mac, but Apple's servers or my ISP/Router.

Went to work, downloaded on XP, put on USB drive, brought it home, copied, installed just fine!

Did a hard factory reset on Motorola Surfboard SBG5560, invalid checksum again.

Going to buy a new router tonight and test it again with dowloading 10.7.4 Combo update. Will keep you posted to see if that fixes it.

Btw, if a new one doesn't fix it then it's my Comcast ISP service that is messing it up. Which is going to make me cry....check out this link... be afraid, be VERY afraid if this is the problem/solution.

https://discussions.apple.com/thread/2585612?start=75&tstart=0

Same problem here, but I have a mac mini.

The fault is on "Software Update" & Safari, not on your router, ISP or whatever...

Try to download it from here :

http://support.apple.com/downloads/#osxlion

I used the combo update, and I did it trough Firefox with DownThemAll! add-on and I added the SHA1 checksum.

Now it should be okay for you.

Good luck!

sebdub thanks for the tip. Worked for me!

Great to hear zerimar3 that sebdub solution fixed your problem!

BUT sebdub, if you actually read the OP's issue you'd realize that is not his problem and that solution won't fix it.

I think jdotmattinson is understanding his issue better, which is either the router or his ISP. Since he was able to download via 3G it worked, which bypassed his home internet connection.

jdotmattinson, which modem do you have? Is it a Motorola SurfBoard Gateway Wireless SBG6580?

I went to best buy and bought another one along with a different modem. This is what I found and how I fixed the issue.

I installed a new SBG6580, provisioned it with Comcast and let it push the firmware over from Comcast.

Sure enough it failed again. Installed a different router Motorola SurBoard SB6121 (which uses a very different firmware) and it installed just fine!

Motorola pushed a new 3.3.1 (I think...) firmware in mid FEB 2012 over to Comcast and to all SBG6580 modems which is causing the issue. It will fail with all large DMG's that require a checksum.

For other folks reading this, either wait for Comcast/Motorola to fix the issue and install large updates on another network and copy them over, or just get rid of that piece of junk router and get another one. That's what I did. Motorola SurfBoard SB6121 with Cisco Linksys EA2700 and all is fine now!

Addictedtomacs007, as I work in IT, I know a little bit what I'm talking about, what you seems not.

The problem, as I had the exact same error, is fixed by doing a checksum (hash check) after the download, what a good download manager should do, and it seems that Safari and the Software Update does not well since I tried to do it 4 times. And when I did it with DownThemAll! it worked first time. It is not the first time it happens to me, and it's not by happenstance that Apple provides a SHA1 checksum, don't you agree?

Now if you want to spend money everytime you've got a problem, I'm sure Motorola or Cisco will be happy! 🙂

If you're router works for everything else, except this update, do not put the fault on the router (or firmware).

I'm happy my solution works for people, it's why I posted, not to be argued because you think I'm wrong, so if you have another solution, just post it and do not debate. Thanks.

"....seems that Safari and the Software Update does not well since I tried to do it 4 times."

Sebdub, what router are you using? Have you checked with another router or contacted your ISP? Let me know, as I was able to fix the issue with Software Update by using another router. Post your logs, that would help too.

Thanks you two for your responses!

I finally got an answer from Comcast, which was that the firmware (given from Motorola and which they just "push" through to the modem) in some instances causes issues with the router/wireless network packets. This was proven when enabling RG PassThrough which bypasses the router/wireless gateway and makes the SBG6580 act as a pure cable modem only. When the tech and I did that no checksum errors or software (Transmission app) port UPnP errors occured.

I was advised to keep with my new Motorola SB6121 cable modem and Cisco Linksys EA2700 wireless router combo, until Motorola fixed the issue.

Firmware:

SBG6580-3.3.1.0-GA-11-070-NOSH

Not sure if this helps the OP with his issues, but thought I would share.

Having the same problem. Have Time Warner's Wideband, not Comcast but this is the second thing I've had a similar problem with. I downloaded a large dmg the other day and it wouldn't open because it was corrupt. It seems like sedub's solution works here, but what about files from the App Store or sites that don't provide a hash? It's a pretty major problem.

Thanks, sebdub,

DownloadThemAll really solved my problem on Mac 17"

Re: can't update my iMac to 10.7 anything! 2011 iMac; New iPad; 2008 MacBook

Spokane, WA

Downloaded 7.4, 7.2, 7.1 and could not find 7.0. I want to get iCloud but am not thinking not in this lifetime. I am not as computer literate as all the earlier responders on this issue. All I want is my computer to be able to get OS updates and not just the routine software updates. Please help! Moondancer 2