IgorNanais on "[Plugin: Contact Form 7] Contact Form not showing "Success" after Submit"

I hope this works for everybody else who's looking for this topic.

open really-simple-captcha/really-simple-captcha.php

214 foreach ( $suffixes as $suffix ) {
215 $filename = sanitize_file_name( $prefix . $suffix );
216 $file = trailingslashit( $this->tmp_dir ) . $filename;
217 if ( is_file( $file ) )
218 unlink( $file );

you have to replace "trailingslashit" to "untrailingslashit" on line 216.