Can't update an existing project.

I just tried to open a project I’ve been working on on and off for two years when suddenly it demands that the project be updated. I try to do that and then it says it can’t be updated.
It’s a pretty important project…

Please view dialogue boxes below and advice.

Kind regards
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It can’t update because it can’t backup first, which Scriv wants to do.

The first message claims that you are trying to backup to a drive with insufficient space. Where do you keep the backups? What drive does Scriv preferences point at? Start by checking that, and possibly change the location.

I checked the backup location but there’s plenty of space.
But tried to open the latest backup and that worked fine. Something must have gotten corrupted in the original file.

Happy again!