El Capitan Installation Issues Solved/Closed

Question

Hello,

I am actually facing two related problems.
Following the acquisition of an iPad Air, I am trying to connect to my iTunes to retrieve my configuration from my iPad 2. During synchronization, iTunes tells me that it is impossible because I do not have the latest version of iTunes.
So I am trying to migrate to OS X El Capitan to attempt this synchronization... I am not sure if this will be the solution...
The second problem is that I am downloading the famous El Capitan via the Apple Store, and once finished, I start the installation, but I get an error message:
"Unable to verify this copy of the OS X El Capitan Installer application. It may have been damaged or altered during installation." Delete the copy of the application and go to the Purchases page of the Mac App Store to download a new copy.
And basically, I can't go any further.

If you have any ideas on each of these issues, thank you in advance!

Configuration: Mac OS X Snow Leopard (10.6.8) / Safari 5.1.9

poney_75 · Accepted Answer

The cause of this problem has already been mentioned by several people; it is the difference in date between the moment the Mac OS installer is downloaded and when it is installed, which is too significant. To solve this issue, you need to make the installer believe that the installation is happening in the days following the download. Therefore, you need to do:

1/ know the download date. You can do "Command+i" on the file "Install OS X El Capitan," for example, and note the date indicated in the "created: ...." field, for example, October 17, 2015

2/ at the time of installation, disconnect the ethernet network to prevent the computer from syncing to the date (via the ntp protocol)

3/ open the terminal and enter the following line:
>date {month}{day}{hour}{minute}{year}
replacing with the correct date. For example, if my installation file was created on 10/17/2015, I will make the system believe that it is 10/18/2015 at noon, for example, so:
>date 1018120015

4/ start the installation

*_Francis_* · Answer

Good evening,

the message is indeed clear. You are asked to delete the downloaded El Capitan application because it is corrupted.

Once deleted and the trash emptied, you need to relaunch the App Store, go to the purchase list, and download El Capitan again.

What is preventing you from following this process?
--
Have a great day :-) - Francis
Always provide your exact system configuration and read the entire response given.

*_Francis_* · Answer

Hello,

that's surprising... we can imagine that the internet connection isn't reliable enough and that the downloaded application is corrupted, but once, sure... twice at a stretch...

but now...?

what exactly is the model of the Mac?
is the internet connection reliable?, with a decent speed? (Sfr, Free, Orange... any others?)

What does the system say about the downloaded application (Read the information...)

example for me:

--
Have a great day :-) - Francis
Always provide your exact system configuration and read the entire response given.

h7k3r · Answer

Good evening,

I don't quite agree because last night I faced the same problem with installing OSX

- I tested OSX10.11 (even the beta), OSX10.10, etc., always the same problem.
- tested from another Mac as an external HDD, formatted, etc... same result
- to note that the time and date are set to automatic, and I still entered the command line... same result
- as for the internet connection? the files worked before, taken with my personal Mac from the store, I have already reformatted several machines with these files, I restarted the installation from either a USB or my internal HDD, always the same...
- no antivirus (we're on a Mac ;)
- I have indeed read all your previous comments on reinstalling from the console, the issue started there. quitting the store and restarting the download... the "downloaded" button is grayed out, I click on more info about the software, "download" is clickable, so I make sure to click the button... and then... it keeps spinning since... reboot, same...

I will wait for the store to cooperate, I insist on the fact that I am on a Mac that is currently working perfectly (the one I am using to unlock this issue) and that the other tasks are not bugging.

but I have an idea in mind :) I'll get back to you

kind regards

*_Francis_* · Answer

Latiche- Feb 25, 2016 at 7:19 PMJust for your information, and despite my efforts, I still haven't managed to upgrade to El Capitan! It keeps crashing...  Hello,  So do the following:  - delete the version of El Capitan that was downloaded from your Applications folder. - empty the trash so that there is no trace left on your hard drive. - Launch the App Store - go to your purchase list - locate El Capitan and click on the "Download" button  - when the download is finished, the installation window will open automatically - close that window - quit the installation - create a USB installation drive using this method: https://www.commentcamarche.net/faq/44770-creer-une-cle-usb-d-installation-os-x-10-11-alias-el-capitan  Once the drive is made, - boot from that drive => hold the Option key while starting up the Mac to choose the drive as the boot support - install OS X 10.11 from that drive. - optionally you can first run Disk Utility to repair the disk.  Good luck!

*_Francis_* · Answer

Hello,

I have indeed read quite a few articles since then indicating a problem with OS X installation when the Mac is not set to the correct date.

The solution then involves using the Terminal as explained in this example:
https://bensmann.no/changing-system-date-from-terminal-os-x-recovery/

See you later

--
Have a Good Day :-) - Francis
Always indicate your exact system configuration and read the entire response given.

*_Francis_* · Answer

Good evening,

I see no other solution than to go to an Apple Store to get a pre-made key:
https://locate.apple.com/fr/fr/

Before installing, it may be necessary to go through the menu bar and with Disk Utility, completely reformat the disk partition to GUID scheme and obviously to Mac OS Extended format.

We assume at least that this Mac is compatible with El Capitan...?

--
Have a nice day :-)- Francis
Always provide your exact system configuration and read the entire response given.

*_Francis_* · Answer

Hello,

@poney_75,

Regarding this date issue that can indeed be found on several forums, there are contradictory opinions. Some say that the problem arises if the Mac's date is incorrect, in which case the Mac simply needs to be set to the exact time, while others suggest that the Mac should be set to an earlier date.

Why these two contradictory opinions?

In the first case, an entirely incorrect date can indeed prevent installation; for example, if the PRAM backup battery is dead, leading to a Mac displaying a date of January 1970 or something similar. In this case, simply setting the Mac to the correct time will resolve the issue.

In the second case, if setting the Mac to an earlier date resolves the problem, it indicates that the downloaded version of OS X 10 has a bug, containing a certificate with an expired validity period. This is a bug found in certain early downloaded versions. These problematic versions were mistakenly supplied with a time-limited certificate. Normally, simply downloading a new version of OS X should fix the issue.

There are indeed several sites discussing this problem:

https://osxdaily.com/2015/01/19/fix-os-x-install-errors-cant-be-verified-error-occurred-preparing-mac/

https://bensmann.no/changing-system-date-from-terminal-os-x-recovery/

https://apple.stackexchange.com/questions/216730/this-copy-of-the-install-os-x-el-capitan-application-cant-be-verified-it-may-h

https://www.macg.co/logiciels/2014/05/mac-app-store-le-certificat-invalide-qui-empeche-les-mises-jour-82182

https://www.macg.co/os-x/2016/03/anciens-logiciels-dinstallation-dos-x-le-certificat-expire-fait-des-siennes-93257

https://www.macg.co/os-x/2014/02/os-x-109-comment-verifier-la-copie-du-programme-dinstallation-79841

https://www.macrumors.com/2016/03/03/older-os-x-installers-broken-by-certificate/

https://www.macrumors.com/2015/11/12/mac-app-store-apps-damaged-expired-receipts-issue/

https://www.imore.com/heres-whats-happening-mac-app-store-and-damaged-apps

Best regards

Have a nice day :-) - Francis
Always indicate your exact system configuration and read the entire response given

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