SHA256 values for Boot-US Version 4.2.3:

bootus423_eng_install_x64.exe       SHA256:ec1352201e9d1e07056b6508864af089cd354c2c354b07ca599c6f4bab20bfd9
bootus423_eng_install.exe           SHA256:95941359b5c6f9a7f1c2a76607d460ed121de3f7c807f408fc0e8499b717adf6
bootusc423_eng_setup.zip            SHA256:8e17a2a34ff191c33f7ed8694f546cfc9e6de89bd75662468876b5b98487470e


Checking hash values under Windows:
    certutil -hashfile <filename> SHA256
Example:
    certutil -hashfile bootus423_eng_install_x64.exe SHA256