Apps like Torque Pro or Infocar are very affordable, highly capable, and available through official app stores (Google Play/Apple App Store).

Searching for a "keygen" or "crack" for ScanMaster-ELM 2.1 is generally unsafe and puts your computer at significant risk. These files are often flagged as by security researchers; for instance, many antivirus engines identify such keygens as high-risk threats.