Missing file /partials/cf72post-footer-script.php

Warning: include(C:\wamp64\www\xxxx\wp-content\plugins\post-my-contact-form-7\admin//partials/cf72post-footer-script.php): failed to open stream: No such file or directory in C:\wamp64\www\xxxx\wp-content\plugins\post-my-contact-form-7\admin\class-cf7-2-post-admin.php on line 318

Indeed this failed is missing, in your plugin source too.