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Question: Installing Yosemite fails

I am trying to install Yosemite on a MBP 17" from 2010.

I have erased the harddisc and and tried to install via wifi. The installer says that it can't approve the installation and I should try again – I have tried many time over 24 hours, and always the same.

The I have created a bootable USB installer, and now it says that the installer can't be checked and it might be broken og damaged. I then made a new USB, but still the same...

What should I do? Please help!

Kind regards,


MacBook Pro, OS X Yosemite (10.10)

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User profile for user: chrills

Question: Installing Yosemite fails