Can't Verify OSX Mavericks Download

MBA, purchased 4 days ago. Download 3 times, same problem. Tried different methods from this forum. Seeking a solution.

By the end, I found my way to generate an USB installer using a Mountain Lion installation running under virtualbox. It seems to work, so I guess my app store download is good. I will install it on my mac during the next weeks.

Probably the best thing is to wait a little, because most of the Apple users are now trying to download Mavericks, and servers are overcharged.

mine is a MBP early 2011 😟

Hey guys - i think i might have found out what the issue was (well what worked for me..). The power settings were set to go to sleep as often as possible, which is why i think that would have corrupted the download. What worked for me was:

Go to System Preferences

Energy Saver

(Making sure you have power connected) Select the Power Adapter setting

Computer sleep: Move the slider over to Never

Display Sleep: doesnt really matter what thats set on

Put hard disk to sleep when possible: Uncheck

Wake for Network access: Checked

Enable Power Nap while plugged into a power adapter: Unchecked.

Now exit and redownload Mavreick! Hope that helps

It's maybe not a solution, but I used an RJ45 cable on my third download instead of wifi to download it and it worked.

I get the same error when trying to install Mavericks and have tried about everything. I have downloaded this 5 gig installer about 5 times today already.

I went so far as to reformat my drive, reinstall mountain lion, and try the Mavericks update on a brand new install. After that failed, I decided to get tricky and make a bootable Mavericks install USB flash drive. It fails with the same verification error.

I finally got it to install. I had my co-worker make me a bootable Mavericks flash drive with an 8gig flash drive in stead of a 16gig (that's what I used when I made the first one initially).

Hi all,

I'm having exactly the same problem in my MacBook Pro that I purchased in early 2010. I already downloaded it several times and always with the same result.

The funny part is that I updated my Mac Mini that I purchased around same time and it worked the very first time!! I used the same installation file to try to update my Pro but unsuccessfully 😟

Anyone found a solution?

Did you try my solution?

No, I didn't try but I'll give it a try.

I even tried to use a flash drive but not even that worked!

Asuming i have understand you correctly, Do you mean you saved the same file to a flashdrive and tried again? Or did you download it again? See im pretty sure the issue is the fact that we download it, though we leave our machine alone, it goes into standby and the HDD are put to sleep. So for what ever the reason is, the file becomes "corrupt" and though the download looks like it completed.

To verify the file is correct open a terminal and run:

shasum /Applications/Install\ OS\ X\ Mavericks.app/Contents/SharedSupport/InstallESD.dmg

Result:

e804dea01e38f8cd28d6c1b1697487e50898dbe7 /Applications/Install OS X Mavericks.app/Contents/SharedSupport/InstallESD.dmg

I used the installer I downloaded on my Mac Mini and that worked (I managed to update it using this file) and copied to a flash drive using this.

I rebooted and selected the option to install Mavericks from USB. After few minutes of "doing something" it gave me exactly the same error.

Ok one more issue i just found out with this is you need to make sure your RAM is not higher then 4GB (or the original amount it came with - E.g. 2GB). For some reaosn the Macbook Pro 2011 models (and possibly others) dont behave nicely when they have over 4GB RAM when doing an OS X Install.

I can confirm the same files downloaded (that originally had failed) worked after a shutdown, replaced the RAM with 4GB, turned on and ran the installer. This machine had 16GB RAM prior. When the install is finished, i will return the RAM and am sure it will be fine. Will post if otherwise.

Bit of a nuisance but hey it works.

I've tried your solution about changing the power management profile - it didn't work.

P.S. macbook air mid 2012 with 4 gb ram

What error are you receiving?

Is there anything custom on the machine? I asume its all pretty standard by the sound of the specs.

If its stock - remove any devices connected. Make sure you have backed up your machine (run timemachine) and then restart your machine and try again.

Did you check the checksum of your downloaded file? Does it compare well?

You should also check your HDD doesnt have any issues - Run Disk Util, select the HDD and then verify disk. any errors? try to repair but make sure you have run timemachine before hand in case it really is your HDD and it goes to S**t..

If all else fails - call Apple tech support. It could be you have a fault with your machine (e.g. RAM issues which wont allow you to continue).

Well. My download was eventually successful after 4 attempts. I want to get u guys the checksum of the file but the it was erased by the installer after the successful installation. :(

I do have 4 extra gigs of non apple ram installed in my mid 2011 iMac. Not sure if

That was part of the problem.