Q: Can't Verify OSX Mavericks Download

I've the same problem - MacBook Air Mid 2012.

Downloading it about five times, everytime the same. Tried also restarting and so on, but nothing works.

OK, after at least 20 attempts at downloading Mavericks from the Apple store and getting the same issue as the other people in this thread, I downloaded a Bittorrent copy of Mavericks and used that for the installation. It worked perfectly.

What this proves to me is that there is some sort of corruption occurring to the file during the download process from the Apple store, but how and why this is occurring, I cannot say.

What I would say to you, is that there are Maverick downloads available from Bittorrent that will work perfectly well. I can't post links to such things for obvious reasons.

jeez, apple.  Can't we check the data periodically during the download process.  Must we wait until we have completly downloaded the 5.3 GB file and then find out is corrupt.  It seems the answer is retry or obtain from a bittorrent pirate site.  Nice way to roll out a product.  I am on a DLS line and it took me 24 hours to download attempt #1.  It appears that I need to keep trying....5 or 6 times.  I am sure the ISP/NSP's are loving this, multipe users downloading 5GB files repeatedly.  Is the Mavericks rollout being handled by the Apple Maps team?

This is crazy. I downloaded it 30 times. I tried everything, what I found on internet. Nothing helps. That's why it is FREE now - Think different.

Like a few other folks who replied earlier, I ultimately solved this problem by creating a bootable installer drive on a Mac that had already installed Mavericks successfully and then installed from that onto my Mac that was failing when installing via the App Store.

I think the people who solved the problem by replacing DIMMs maybe onto something. I hypothesize that when you run the installer from the same disk that will be installed upon, perhaps it is doing something funky under the hood like creating a memory volume which can be corrupt if you've got a bad DIMM. That would also explain why some people succeed if they try enough times.

Apparently, whatever it is doing which is so vulnerable to bad memory doesn't happen if you install from a different drive than the one you are installing to.

Instructions for creating a bootable install disk are here:

http://support.apple.com/kb/HT5856

After 6 times I finally installed Mavericks.

On the 5th time. I watched  the whole downloading, and I found out at the time it almost finished downloading and it just jump to finish.

So I guess it hadn't been fully downloaded. The problem may be caused by Apple servicer. I think this is why every time when I check MD5 it was different.

On the 6th time, I downloaded still 3.7gb, then I paused downloading. Restarted my MBA. Once it restarted, I resumed downloading and this time it was successfully downloaded.  Installed it with no problem.

This method suit my MBA purchase few days ago.

P.S. I also tried checking ram, verifying disk and creating a new admin user, but those methods are not working for me.

Hello everyone,

After numerous tries on day one and two, reading several posts, and taking a day of break from this craziness. I gave it another shot today and I was finally able to install OS X Mavericks!  Whoot, whoot!  Here's what I did, I hope it works for someone as well.

1.  Download a fresh copy (make sure you don't let your MAC go to sleep while downloading)

2.  Unplug anything connected in the back of your MAC (except your power cord, of course)

3.  Create a new profile (one with full admin rights)

4.  Restart and log in with the new profile

5.  Install OS X Mavericks from your Launchpad

That's it!  Like I said, it worked.  I have tried all sorts of attempts suggested by several folks, except for removing my extra 4 Gigs of RAM, as someone suggested in one of this thread, which would have been my next step had this not worked.  Anyway, good luck! 

Hi All

Computer: MBP Mid 2009

I have been able to install my copy of Mavericks after facing this issue, by abandoning the usb boot drive.

I was trying to install to a freshly erased ssd from a usb boot drive that I made according to the instructions from Macworld. I tried several times to no avail and kept getting the message as per the OP.

What I then elected to do was use my bootable clone of Mountain Lion on a portable HDD, and boot the MBP from this drive.  I then used the Mac App Store to download the installer for Mavericks. 

On first try my erased SSD was not mounted, so I zapped the PRAM and rebooted from the clone and there she was.

I then proceeded to install mavericks to the fresh SSD inside the MBP - note you must select this drive during the install process.

Hope this helps some of you -  It is also a reminder to me to always do a backup before upgrading.

Cheers

Steve

Yesterday I've installed it on two airs that had the same problem before. I've changed nothing, just downloaded it as usual and everything was ok.

I suppose that the problew was because of apple services were extremely loaded.

Finally it worked for me!!

After 5 attempts of downloading it at home with my two different wifi-networks, i had no success.

But then i tried it with the wifi-network of my parents, so different wifi and different internet-connection.

-> It worked, and no errors or so.

I can say, the problem was my internet connection!!

Worked for me, as well, after the fifth attempt.

The only thing i did different is that i upgraded my OS from Lion to Mountain Lion.

I have tried to install Mavericks on several machines.  If I walk away and come back hours later it never works.  I go through the process and a NEW download starts all over again.  Frustrating.  If I get back to the machine soon after it finishes downloading, and proceed, it seems to work.  Why it redownloads once it has completed I do not understand. 

For those who don't know, to run a system test (memtest) on your Mac, restart and hold option(alt) + d (or just d if not connected to the network). It should load up with a blue screen with a few options, choose the one that does a full test.

So that's why mine actually worked when I changed my RAM. I thought it was the memory size, though it isn't - I just had bad memory. I eventually did the hardware test on my machine, and my RAM came back faulty.

meadowsoft - I agree, it would be nice if the install came back with more useful information on why it failed, rather then an error that suggest you to think the file you downloaded was actually corrupt. I can kinda understand why we get that error though, as when you run the installer - it is uses the RAM to cache the files, which then in turn (the faulty RAM) is corrupting the files and we are receiving the "This copy of the Install OS X Mavericks application can't be verified. It may have been corrupted or..." error. SO the download itself is actually fine, just the faulty RAM is corrupting it..

As medaowsoft mentioned, I would also recommend anyone who is having this issue to run a system test to verify its not a hardware issue.

Good Luck!

Well, the other day I tried once again to install via the normal way and it worked. It simply worked!

Thanks for your feedback, I was already with the screwdriver in hands to open the back lid