Yes, the installation went without a problem, after the installation, I did the finalization procedure, waited the 60 seconds requiredDid your 15.26.1 go to the end, and did you follow the finalization procedure as explained in the "read me" text ?
You can try to re-install it again.
Oh, your USB key must be EXACTLY as requested.
I tried to reinstall, but when I reinsert the USB, it says that the update is not required
And the USB meet all the requirements for the installation
I'm not sure that after the 60 seconds passed the navigation was completely off