- DO NOT plug VAG-COM cable into computer yet.
- Uninstall any other VCDS versions, if present on computer. Then delete c:\Ross-Tech folder.
- Install “01-VCDS-Release-21.9.0-Installer.ex” step by step, when window bellow appear tick/check on "Install 32-bit EXE on 64-bit System"
- If the installation is successful, do NOT run the software.
- Exit the Installer.
- Plug VAGCOM cable into PC. Wait about 20 sec for Windows to auto-install drivers.
- Windows will install drivers automatically, If driver install fails, skip to Troubleshooting.
- Start > Startup > Right-click "RT-Updater" > Delete
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Disconnect computer from internet and Deactivate Anti Virus software on your computer (Files used in next step are highly modified files and are recognized by antivirus software as a virus so those file are deleted and prevented from use). You can also add C:\Ross-Tech\ folder to folder exclusion, Here is how: Windows 10
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Golden Rule: Internet must be disconnected always before launching VCDS and DO NOT UPDATE THE SOFTWARE!.
- Read golden rule above? If yes, then...
- Install 02-VCDSLoader English.exe (only English) to C:\Ross-Tech\VCDS
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In future, ALWAYS START VCDS Program USING “VCDSLoader.exe” from C:\Ross-Tech\VCDS\ folder.
- You can optionally create shortcut to VCDSLoader.exe on your desktop
- Connect cable with your PC and plug in interface into Car OBD2 first, then Run VCDSLoader.exe
- Go to: Options » Test (leave it as USB)
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It should show "Port Status: OK" then go to User Interface and Identification Tab and set option Check for free updates to Do not check for updates
- Click Apply then Save.
- You're now ready to safely scan your car!
Troubleshooting:
You are here because when you inserted VAG-COM cable for first time, Windows failed to install drivers properly.
SOLUTION 1:
Leave cable connected to computer. Restart computer. It should be fixed now. Go to Step 3.
SOLUTION 2:
VAGCOM cable should be connected to computer.
1) Go to Control Panel.
- Windows Vista/7/8/10: Control Panel » System » Device Manager
- Windows XP: Control Panel » System » "Hardware" tab » Device Manager
2) Expand "Ports (COM & LPT)" or "Universal Serial Bus Controllers".
You're looking for a device that has name "Ross-Tech" in it. It will have a yellow mark next to it like this: 
Here's an example: 
OR it may show as "Ross-Tech Direct USB Interface".
3) Right-click on this device with the yellow mark » Update Driver Software.
4) Choose "Browse Computer for Driver Software".
5) Browse to: "C:\Ross-Tech\VCDS". It should look like this:
6) Click "Next". When you get below message, choose "Install this driver software anyway".
When driver installation is complete, disconnect cable from computer. Restart computer.
When you're back in Windows, you may connect cable into computer, and go to Step 3.
SOLUTION 3 :
If after SOLUTION 2, cable is still showing a Yellow mark (), then you're likely on Windows 8, 8.1, 10 or above.
In this case, disconnect cable.
And disable driver signature enforcement. Here's how: Windows 8/8.1 | Windows 10
When done, go to Step 3.
License Revoked problem
*If you get license revoked (what can happen if program is nor run using Loader, AntyVirus is not fully deactivated or computer is connected to Internet), fully uninstall and delete VCDS then restart computer and do full installation again.