How to access 2014 files from Dropbox

Hi wonderful scrivener folks, i have been away for a long time.
Can any of you help me retrieve my writing?

Have any of you any idea how I can upload old scrivener files from my dropbox (2014 and 2017) to IOS on an ipad?
I created them on an ancient Macbookpro, which I still have, but it is only running MacOS Sierra 10.12.6 and I can’t seem to upgrade it as hard as I try.
There are no laptop files as these were lost by a freak incident which broke two external hard drives when I moved house and there are no files left on the Macbookpro, so the only copies I have are those on Dropbox.

When I try to open them on my 2022 ipad I get the message:
“Invalid project.
The project cannot be opened because it does not contain a valid binder structure file. Please ensure that the project has been fully uploaded from other devices and then try syncing with Dropbox again.”

Of course I can’t check if they were uploaded fully, though I have no reason to suspect they weren’t as all was working fine back in the day.

Yours, in sweet desperation,
Marie x