Composer autoloader not found. please run "composer install"

I have PHP 7.2.2. When I try to install SuiteCRM 7.10.9. in windows 8.1, I got an error message like this.

Composer autoloader not found. please run “composer install”.
How to solve this?

If you can install “git bash” console for Windows, you can run “composer install” from there.

Another option (probably is to install a Windows version of composer, that probably exists somewhere).

But before any of that - how exactly did you grab the files? From the installer zip, or directly from GitHub, or copied from another server?

Thank you Mr.pgr.
I downloaded from suitecrm official website in ZIP format