Thanks for your help, Richard.
FTP worked (scary region for a non-technical artist)
I cannot update to the latest version. Trying to update via Dashboard / Plugins fails for the following reason:
Download failed. SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
I downloaded the zip file to my computer and tried uploading from there but that failed too because the file was “too big”.
Any answers, please?
Thanks. That seems to have fixed it.