For the correct download of tachograph .DDD files, it is first of all important to remember the important conditions:
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1) downloading should be carried out with the ignition constantly ON and connected to the tracker wire Din4 (Din4=1) throughout the entire download process.
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2) during the entire download of tachograph files, the card of the company that owns the right to download tachograph files must be connected and the computer must not go into "sleep mode", the card must not be disconnected until the file has been successfully downloaded (in this case, the card must have an unexpired period of use).
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3) It is important that after a successful download of the tachograph file, the "icon" of the downloaded file should be on a white background, because if you see that the downloaded file is highlighted in red
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, this indicates the need to download the files again, since an error may have occurred during the download process (which could be due to turning off the ignition and the tachograph itself during the download process, this could also happen due to temporary problems with data transfer if the vehicle was in a region with a low quality GPRS / Internet connection).

The photo attached below shows an example of a successful download of tachograph files.
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Please consider this information and recommendations in addition to other instructions available on this topic: https://my.ruptela.com/hc/en-us/articles/4406613290001-Tacho-DDD-files-download
​https://my.ruptela.com/hc/en-us/articles/4406743834001-Tachograph-Solution-video-