Quick summary

The file you selected isn't a Lightroom Classic catalog. Imagen needs a catalog file that ends in .lrcat.

How to fix this

1. Select the catalog again. Choose the file that ends in .lrcat. Don't choose these files and folders that sit next to it:
   • .lrdata folders (previews)
   • .lrcat-data folders
   • .lock, -wal or -shm files
   • Backup .zip files
2. If you can't find the catalog, open it in Lightroom Classic, and go to:
   • Mac: Lightroom Classic › Catalog Settings › General › Show
   • Windows: Edit › Catalog Settings › General › Show
   The catalog is usually in Pictures/Lightroom.
3. If you only have a backup .zip, unzip it first, and choose the .lrcat file inside.