SuiteCRM Install Problem on Windows, Composer autoloader not found

I have added added SuiteCRM to my web server and when I go to install.php I get the error message: Composer autoloader not found. please run “composer install” I do not get to any sort of installation wizard. Please advise.
Here is the info for my system:
Windows Server 2012 R2
PHP 7.1
IIS Manager 8.5
SQL Server 2016

I never tried this on Windows, but maybe with this

https://getcomposer.org/download/