Thanks for this hint – i’ve been searching for ages!
If you want to avoid the auto-update function, you can alter the version number to e.g. 99.99.9. It is to be found in the wp-customer-reviews.php file on line 6.
Im my version of the plugin, the text above the form cannot be saved in the admin page. Meaning if i type the text for opening the form the same text is automatically used as titel text for the form. In the frontend though the default text stays the same. The use the same text for form title AND form opening you can alter code in line 1040 following way: ‘$this->options[“goto_leave_text”]’. (Adding goto_).