Thanks for the share!
For those installing this, if the software locks you into the Japan region (since it is labeled JAPAN), you can usually enable the region selection menu by editing the configuration file.
Open this file in a text editor:
INI:
C:\Program Files (x86)\Toyota Diagnostics\Techstream\Env\IT3System.ini
Find the line for
TISFunction and change the value to
0:
Save the file and restart Techstream. This should allow you to select North America, Europe, or General regions.
Also, don't forget to disable Windows Defender or add an exclusion before extracting the key generator, as it will likely be flagged as a false positive