Intallation Note1.Please don't install 2 software versions in the same computer. Files will conflict with each other. One computer can only install one software. If you want to reinstall another version in the same computer, you need to reset system or format C disc.2.Antivirus software needs to be closed when installing driver otherwise some files might be deleted.3.Please make sure the Voltage is up to 12V4.Please put [all parts] all together to the present folderNote: Both of them can NOT update Firmware/ Driver. Don't Update!!! Otherwise it will be locked and need to repairWhat's the different between 1.6.6 version and 1.8.4 version?1.6154 v1.6.6 Firmware Version is 1.6.6.0; License to 2030-12-31(can only install CD v1.6.6 driver, CANNOT UPDATE the Firmware and License to 1.8.4.0 or newer)2. 6154 v1.8.4 only works for V series6154 v1.6.6 only works for porsche/V series3. 6154 v1.8.4 can work with V5.1.6/V6.2.0/V7.1.1/V7.2.1.....6154 v1.6.6 only works CD software, 1.6.6 only support the software version under 6.2.0 ( never try to install higher version!!! )6154 Computer System Requirements:Win 7 Professional version/WIN 10System C:// have to be NTFS formatC:// need to have at least 40GB avaliable space for installing 6154Color: As ShownMaterial: plasticPackage Contents:1 x 6154 Interface1 x USB cable4 x CDOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.