I tried installing mavericks and i always get "This copy of the Install OS X Mavericks application can't be verified. It may have been corrupted or tampered with during downloading."

Update:

Attempt no. 6 was succesful! Mavericks is running.

So, patience might be helpful 😉

I ran into this problem on 3 different Macs at work, all were running 10.9, and I think I've got it solved as of this morning. On each Mac, I downloaded Mavericks from the App Store and created bootable installation media using the "createinstallmedia" command, instructions for which are here:

1. http://support.apple.com/kb/HT5856
2. http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install -drive.html

Using the created bootable install media, on a flash drive, I received the ".. can't be verified..." error on any other Mac I attempted to install Mavericks on. I redownloaded Mavericks from the App Store multiple times; sometimes I left the already downloaded copy in place, other times I deleted it before downloading a new copy. Nothing worked.

One workaround was to install 10.8.x on another MacBook Pro, then download Mavericks from the App Store, create the install media via the Mac running 10.8, and that allowed me to use that media on any other Mac successfully. A colleague and I even upgraded the Mac that was running 10.8 to 10.9. We then tried creating bootable install media again, and that continued to work on other Macs.

Another workaround that reaffirmed my faith that there was nothing wrong with my existing Mavericks install on the 3 Macs I first mentioned was to create another admin-level user account.

While logged into the new account on one of the three Macs that resulted in the "..verified.." error when using bootable install media created from them before, I was able to create bootable install media and then use that on another Mac.

Thus, long story short, at least in my case the error seems to be rooted in some problem with my existing user accounts on all 3 Macs. All 3 Macs were built with Mavericks via a clean install, using bootable install media that was patched together by restoring the contents of the invisible BaseSystem.dmg disk image to a flash drive. After installing, personal data was restored using the Migration Assistant at first boot.

So my suggestion for anyone here would be to create a new admin-level user account on their Mac, and try upgrading in place. Likewise, using a new account appears to allow for viable install media to be created.

The problem I had was not with the download but with the command to create the bootable image. It kept giving a corrupt image. Check the MD5 of the BaseSystem.dmg in the Install Mavericks app and the one on the USB drive, if they don't match keep running the command until you get it to match. It took me 3 tries to get it to copy correctly. There must be bugs in how it copies.

For what it's worth for those with their Mac running a language other than US English try this solution:

g4rra

This solved my questionRe: Upgrading iPhoto 9.4.3 CD Version to 9.5

Oct 24, 2013 12:28 AM ( in response to heavy metaller)

Change the language of OS in preferences for any other, reboot your mac, open mac app store and updates would show up. Somehow worked for me and my friends 😉 Then you can go back to your orginal language.

Ok, now the question is how to fix it when I formatted the hdd first and then ran the install from the usb.

Yeah 6 attempts of downloading and installing. Now I can't download the so anymore omg what's going on?

Seems that for most users the diskutility (in the installer itself) repair disk thing does the trick ... unfortunately for me it did not, but here is how I got around:

- plugged in an external harddrive that could be formatted.

- in the installer selected the external harddrive as the disk on which the upgrade needed to be upgraded.

- once installation completed Mavericks will run fine from the external drive and the so called corrupted internal drive is mounted and visible...

- import users with the migration assistant: all date is recovered!

- reboot with option key to select another boot volume

- select OSX installation volume

- use the diskutility to format the internal drive

- install Maverickx on the internal drive

- import the users again from the external drive with the migration assistant.

6 attempts of downloading + 2 attempts of installing ( 4 downloading attempts failed).

And I'm nose bleeds haha. Too technical for me I'm not a tech person. Can apple make a solution for this?

Did you restart your computer or anything between trying to install it again or did you just try installing it one after another?

All I can say is it starting to remind me of PC issues !!!!! Apple is losing the edge!

Thanks for adding something valuable to the conversation.

I changed the date as outlined here:

http://blog.mconserv.net/2013/10/install-os-x-mavericks-application-cant.html

This worked for me!

Thank you so much Bill! You saved my computer! I did exactly what the post said and it worked. I was just going to ignore your post because it seemed so stupid that it could just be a date issue especially after all the other more complicated things I have tried. You are a lifesaver.