Duplicati won't start: "This is likely caused by upgrading to a newer version and then downgrading"

3

Had the same issue after accidantly installing the latest canary release.
Solution for Windows:

  1. reinstall canary
  2. export configuration
  3. remove canary
  4. delete C:\Users\<YourNameHer>\AppData\Local\Duplicati
  5. install release
  6. import configuration
  7. run repair

Maybe you can avoid the repair by just deleting C:\Users\<YourNameHer>\AppData\Local\Duplicati\Duplicati-server.sqlite

I wouldn’t have consider a downgrade but on canary the FTP connection to my local server was no longer working.