Following the instructions found here while using PHP 8 Beta 1 I am getting a PHP Deprecated error for the openssl_free_key() function. From the command line using:

php composer-setup.php --install-dir=d:\composer

The complete error shown is:

Deprecated: Function openssl_free_key() is deprecated in D:\composer\composer-setup.php on line 1034

From the command line the phar file DOES get created. Using Composer-Setup.exe fails with the same error but no phar file is created.

I expected the installation to complete without errors. At least with the command line method I do get a phar file but not with the GUI version.