So, I followed your recommendations and on the WordPress message about “Hotel Booking Checkout Fields” the proposed version has now gone from 1.0.1 to 1.0.2.
I have tested the update of “Hotel Booking PDF Invoices” which was well accepted by WordPress and seems to solve our problems.
Then I tested the updates of “Hotel Booking Payment Request” and “Hotel Booking Checkout Fields” but the message from WordPress is still : The update failed: You have the latest version of this extension.