2. Downloading and installing the software.

CO₂MPAS is fully developed in the Python programming language. The CO₂MPAS All-in-One is a utility developed by the CO₂MPAS-Team to provide users a fully functional Python environment to be able to run the CO₂MPAS tool. It is important to be aware that CO₂MPAS results depend on the version of the Python libraries installed in the computer. Therefore slightly different CO₂ predictions may occur for different combinations of Python libraries. The All-in-One contains all the Python libraries (updated to their last version at the time of the release) needed to run CO₂MPAS in computers running Windows. For type-approval declaration purposes it is mandatory to run CO₂MPAS through the All-in-One utility since this is the only way to guarantee that the CO₂MPAS results are reproducible and repeatable.

To download CO₂MPAS an install it in your computer follow the following steps.

• Check the CO₂MPAS releases webpage and download the last All-in-One version (right click and Save as the .7zip file). Note that it is a compressed file weighting some ~365 MB file.
• Uncompress the All-in-One file that has a .7z extension with the 7-zip software. This software is similar to winzip and winrar but unlike those, 7-zip avoids out-of-memory errors when expanding long directories. 7-zip software can be downloaded for free from here. Note that uncompressing the file can take up to 20 minutes.
  
• Double-click on the INSTALL.vbs file which will add CO₂MPAS in the Windows Start-Menu.
• It is possible now to use CO₂MPAS utilities from the Windows Start-Menu.

Linux users with a Python-3 installation with the scientific Python libraries updated to the correspondent All-in-One versions (list of libraries), can install the CO₂MPAS package through the command console (pip install co2mpas).

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