There should be a BPN file which is a backup of the last save of your PLN.
You can open these BPN files just like a PLN.
Is there anything in your operating system recycle bin that might be useable?
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11