Moving half-downloaded without magnet

[adrjork]

Hi guys,
I've this setup: I'm loading Transmission on a macbook_1 but the location folder (with the partial files) is in an external drive.
Now I have to change the mac on which loading Transmission, so I need to install Transmission on a macbook_2 and resume all the partial files in the external drive.
My problem is that I've no .torrent files to re-active downloading and no magnetic-links.
So, how can I resume the downloading of all my oartial files?
Thanks a lot.

[adrjork]

Thx so much!!!