I also got the same problem.
windows+apache – everything works fine
windows+iis – problems with redirection.
In debug mode I’ve got this output:
PHP Warning: Cannot modify header information – headers already sent by (output started at C:\Inetpub\wwwroot\wp-andr\wp-includes\functions.php:3587) in C:\Inetpub\wwwroot\wp-andr\wp-includes\pluggable.php on line 866
PHP Stack trace:
PHP 1. {main}() C:\Inetpub\wwwroot\wp-andr\index.php:0
PHP 2. require() C:\Inetpub\wwwroot\wp-andr\index.php:21
PHP 3. wp() C:\Inetpub\wwwroot\wp-andr\wp-blog-header.php:14
PHP 4. WP->main() C:\Inetpub\wwwroot\wp-andr\wp-includes\functions.php:1570
PHP 5. do_action_ref_array() C:\Inetpub\wwwroot\wp-andr\wp-includes\class-wp.php:510
PHP 6. call_user_func_array() C:\Inetpub\wwwroot\wp-andr\wp-includes\plugin.php:486
PHP 7. pmpro_besecure() C:\Inetpub\wwwroot\wp-andr\wp-includes\plugin.php:486
PHP 8. wp_redirect() C:\Inetpub\wwwroot\wp-andr\wp-content\plugins\paid-memberships-pro\paid-memberships-pro.php:1183
PHP 9. header() C:\Inetpub\wwwroot\wp-andr\wp-includes\pluggable.php:866
