Recuva Pro, on USB

[AngelArcherWasRight]

See quote at end then read my question :  I don't use Bart PE, i want a bootable USB that will boot the PC alone, no OS.
 I would like to use my Recuva Pro and how will it recognize the licence if I put the installation files on a usb drive ?
Does that work? This way it will recover files booting recuva pro on an external USB drive ,
then I have 1 external hard drive to which the restored files are saved,
I search files that are lost from a computer's 3 hard drives, I'd recover data 1 HDD at a time, one after the other, but always saving recovered data on the external HDD.
2SSDs, 1 PATA hard drives are on the computer.
Could this be done. Haven't found an answer yet confirming recuvaPro licensee can use it as DOS to get on a computer without booting its windows. The Recuva PRO software should be on a USB key to do so I don't wanna boot the computer to lose data from the system file created as cache on boot.

<<There's no need to incorporate Recuva into BartPE just store the files on a flash drive,
boot BartPE with the Flash drive already inserted and it should be ready to access.>>

Edited September 10, 2020 by AngelArcherWasRight