I'm not having any luck at the moment. I tried to backup and upgrade when an error came up, and now I can't access admin, the site or reinstall.

Also when I try to install afresh it comes up with "Could not write the Configuration File zenphoto.cfg"

Without tellling what error came up we cannot help you. FOr the 2nd issue check your file/folder permissions. Info about the correct ones on the troubleshooting guide.

Appreciate that. If I download a previous backup then delete the whole zen folder/installation, I should be able to reinstall zenphoto anew into the same domain shoudn't I?
If I upload the backup file to the backup folder will I then have access through the new admin setup to that file to restore it?

Depends what you previous version was. If older than 1.4.3 there might be database changes not compatible (unless you have a database backup).

In any case the config file is needed so the same database and such.

So you are not willing to tell the error you got so we are not able to help.

Thanks. It wasn't a matter of not being willing just I didn't recall the original error because I went straight ahead to reinstall thinking I did something wrong with the settings. However I've deleted the lot and installed a new one in a new folder, uploaded all my albums and started again. It's done now and all works fine. Thanks for your time and patience again. I'd like to make a donation for the work you put in. The amount might be small but I'll do so regularly. Is that ok?

Glad things are working now. We always appreciated whatever anyone is able to donate. Helps us run the server for this forum and our WEB pages.