Thanks very much for your reply (sorry for the new question, I was unable to comment on your reply!).
Following your instructions, with a fresh download of ImageJ and the toolbox, unfortunately the error message now reads ‘Timeout – DCRAW doesn’t seem to have processed this file’. Is there anything I can do to process the file first so that the DCRaw import function will behave please?
Apologies for the inability to post a reply/comment – I think I’ve fixed that and modified the forum.
The timeout means DCRAW isn’t producing any output. What file format are you trying to open? Maybe you could send me a version to test myself? Also, make sure the RAW file is located somewhere where there isn’t weird system protection (the software needs full read/write access to the directory containing the RAW file). So try somewhere like “documents”.