I tested version 1.39 and 1.43, both showing "Unable to read MFT" - but not in a separate error window as in v1.44, but also at the bottom of the list view.
All versions of Recuva up to v1.44 are unable to scan hard disks > 2 TB!
Note to developers:
Tested hard drives: 3 TB, USB, NTFS, MBR and GPT, 4096 bytes per sector