Now, I have tried again: deleted all the directories except files and cache - uploaded - and can't perform the update.Getting this:

The mobsgift.com page isn’t working

mobsgift.com is currently unable to handle this request.

Also, not clear about these two steps:

Good morning,

thank you for your ticket.

You don't need to perform an update like you would from Live Chat Business.

You will need to replace all files (except cache and files folder) and then open your browser go to yourdomain.com/install/update.php follow the wizard. After that delete the install folder and you are good to go.

We also offer an update service: Update Service.

A server error 500 is a server error. Please check your error log files for more information.

The include/db.php file is available? htaccess file is available when rewrite mode is in use? All files 644 and folders 755 have the correct permissions?

Hello,

We followed your instructions and now when we try to update the application, we get a message "Update already downloaded". Please help.

Thanks and Regards

Good Morning

Please send me access to your server via following form: https://jakweb.ch/access-form

The login data you have provided for the operator are not valid, I can't check what is going wrong.

Thank you for resending the form again.

I have updated your installation manually, please note that in future you will need to do it yourself or we have to charge you 19 USD.

Thank you very much for your support and understanding.