Trouble with booting

[logros]

I have hdd WD 1TB full encrypted, usb flash for booting and enterring password and two file on it HarddiskVolume1.bin and HarddiskVolume2.bin
after 8 years of using this scheme, i entering password on boot have error "bootable partition not mounted".
What i must to do do decrypt my files from WD 1Tb?

[DavidXanatos]

Plug the HDD to an other PC that has DC installed and sue the UI as usual

Alternatively oyu can cerate a bootable Live windows external HDD using rufus and do the same