I don't think they provide downloads, but the document includes an offer to obtain the source:
Components of the software used in the vehicle may be free and open source software licensed under the terms of license of the GNU General Public License, Version 2 (GPLv2), GNU Lesser General Public License, Version 2.1 (LGPLv2.1) or GNU Library General Public License, Version 2 (LGPLv2). Upon request, we will supply the source code of the components licensed under the GPLv2, LGPL v2.1 and LGPLv2 on a data-medium (please specify the designation of your vehicle). Please direct your request to the following address within three years after vehicle delivery:
The copyright holders usually do not provide any warranty and assume no liability whatsoever for the free and open source software components. Note that any modificati- on to the vehicle of any kind can void any warranty claim.
Components of the software used in the vehicle may be free and open source software licensed under the terms of license of the GNU General Public License, Version 2 (GPLv2), GNU Lesser General Public License, Version 2.1 (LGPLv2.1) or GNU Library General Public License, Version 2 (LGPLv2). Upon request, we will supply the source code of the components licensed under the GPLv2, LGPL v2.1 and LGPLv2 on a data-medium (please specify the designation of your vehicle). Please direct your request to the following address within three years after vehicle delivery:
Daimler AG, HPC: CAC, Customer Service, D-70546 Stuttgart
The copyright holders usually do not provide any warranty and assume no liability whatsoever for the free and open source software components. Note that any modificati- on to the vehicle of any kind can void any warranty claim.