Hi Bennouna,
Windows Recovery disk was for Symantec Endpoint Encryption product the current you are using is Symantec Drive Encryption.
The recovery disk is around 1 MB and it does works fine, and once you download it, create a bootable USB to access the disk.
However if you install Symantec Drive Encryption 10.3.2 on other machine and salve the encrypted drive to this machine, the decryption process with be faster.
https://support.symantec.com/en_US/article.TECH149679.html