Hi,
GarageSale 7 should be able to import files that were exported from GarageSale 6. Can you please send me the exported files in an archive (as a direct private message)? I will have a look why the import fails.
Please make sure you are using the latest version of GarageSale 7 (7.0.5 or the new 7.0.6 beta here).
Thanks,
Paul