"This copy of the Install OSX Mavericks..." error message via USB boot

I have an old Leopard MBP and a 2013 Mavericks iMac.

I want to install Mavericks on the Leopard MBP, but had no success since.

Here's what I did.

• I downloaded Mavericks from the MAS on the iMac
• I formatted an 8GB USB drive (naming it Untitled) through Disk Utility
• I ran this in the terminal: sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app/ --nointeraction
• The creation of the bootable USB was successful, so I booted the MBP using the newly created USB drive
• I formatted the MBP internal HDD via the Disk Utility on the Mavericks drive
• I ran the Mavericks drive installer

Near the end of the Mavericks installation, I ran into the "This copy of the Install OS X Mavericks application can't be verified. It may have been corrupted or tampered with during downloading." error.

I re-downloaded Mavericks from the MAS and tried again; same error.

What should I do now?

Check that the date is correct. This is an error that can be received if your date is set utterly incorrectly, typically due to a flat battery prior to install and not being able to connect to an NTP server to correct.

It looks like the Mavericks installer is making a verification of an authenticated checksum with a certificate. If your date is out of scope of this certificate window of validity this process fail.

Look at: Jonathan Mohar receipe to fix a sadistic error message.

A more usefull error message might have been: The certificate of your Mavericks installer can't be verified. Check that your date and time are corrects.

The checksum validation should have been made much sooner in the installation process :{.