VCDS 12.12 (Release 12.12.0 through 12.12.3) was released by Ross-Tech, LLC, around late 2013. Unlike generic OBDII scanners that merely read generic fault codes, VCDS is a "factory-level" diagnostic tool. It accesses the proprietary VAG protocols that dealers use.
If you are specifically using 12.12 (often required for certain third-party or "clone" interfaces), follow these standard installation steps: Vag Com 12.12 Vcds Software Download
If you lost the CD or it arrived broken, message the seller you bought it from (such as on AliExpress or eBay) and ask for a direct download link to their specific matching archive. VCDS 12