Hi, Vincent and Acrylian,
Thank you very much for your support!
In the meanwhile I have received the following message from my web host:
"hWe have gone through your issue and the ZenPhoto 1.4.4 is not yet provided from Simple scripts. The Simple scripts is the service provider which is provided from our side, nothing much can be done you will be able to upgrade the zen photo only when they provide the latest version. However we suggest you to upgrade the application to the latest version manually from your side. If you are not able to upgrade, we suggest you to upload the upgrading files to different directory and get back to us, so that we can assist you further."
Well, "when they provide the latest verion" is not very clear for me...
I would try Vincent's workaround first. I assume that just downloading the original versions on my computer and being able to upload them on the server would be enough in case of malfunction, would it?
As for my web host's advice, I understand that it's OK for them if I just install the new ZenPhoto version. But how to do that? Should I just FTP the files of the 1.4.4 release into the same location? Wouldn't this crash the present settings?
Or are there just a few specific files / folders that need to be copied?