If the error occurs during the "Install Driver" phase within the software, the drivers are being blocked by Windows. To fix this, you must restart Windows in "Test Mode" or disable signature enforcement temporarily.
ECM Titanium is not a commercial product with official support. It is community-maintained. The fixes above are crowdsourced from locksmith forums (Digital-Kaos, MHH Auto). ecm titanium smartkeydll error windows 10
A standard reinstall rarely works. Solutions often involve: If the error occurs during the "Install Driver"