Creating Recovery Disks from Partition on another OS

Hi,

HP Notebook - 15-r205ne (ENERGY STAR)

My laptop came with windows 8.1 64Bits pre-installed, but later I installed a fresh copy of Windows 10 (64 Bits) over it, without making any recovery disks. Now I want to switch back to windows 8.1 , I still have the D Partition containing recovery files, but going to F11 doesn't help me.

Any suggessions on how can I make recovery disks from the D partition within windows 10 and then use those disks to install the original OS back?

Thanks in Advance!