Hi,
it should be version 6.
Information about plugin and server version.
WP Edit pro version: 4.0.4
WordPress version: 6.0
PHP version: 5.6.40
HTML version: 5.0
MySQL version: 5.0.11
jQuery version: 3.6.0
The PHP Installtion was set up by the hoster, I can only choose which version to use. Since I have another WordPress installation with PHP 7.4 on the same server, it should not be an PHP issue.