Firewall and defender need to be closed in case it damages the software.
Best advice is to go for a UK based seller with proper contact details and address. Most versions only require a pc (preferably a laptop), the Techstream software itself, and a special mini VCI cable that will often come with the software when you buy it. Used it on a few cars Mk3 2009 Avensis (my car), Auris Hybrid 2011, and Prius 2007. I got it with TechStream back then, but now using a later version of Techstream.
16Pin OBD2 MINI VCI Diagnostic USB Cable Supported Protocols – K-Line ISO 9141, KWP 200-4, SAE J1850 PWM, SAE J1850 VPW, CAN 2.0B ISO 11898, CAN ISO 15765-4.MINI VCI Diagnostic Test Scanner Function – MINI VCI check engine light shut off, multi-language interface, freeze frame displays, internet updateable, user friendly and others function, heavy duty thick-shielded cable for best test results.
Toyota 22pin connector is available seperately. This package do not contain Toyota 22pin connector, so it can only do Toyota 16pin cars.
Support computer system:Windows XP Windows7 32 bit.If met problems of asking password, just try more times to nstall driver. Supports all the diagnostic communication protocols needed for Toyota (since 1996) Package Includes: 1pc x Toyota MINI VCI OBD2 Cable. Support all the diagnostic communication protocols needed for Toyota (since 1996).Supported Protocols:K-Line ISO 9141 / KWP 200-4 / SAE J1850 PWM / SAE J1850 VPW / CAN 2.0B ISO 11898 / CAN ISO 15765-4.