Never update the software online if prompted; it may "brick" your interface cable. If you'd like to dive deeper, let me know: What car model/year are you working on? Are you getting a specific error code ? Is your cable a HEX-V2 or an older KKL style?
Before starting, ensure your system meets these requirements: vcds 233 1 loader install
Right-click the loader and "Send to Desktop" for easy access. Never update the software online if prompted; it