You already have the latest version of Recuva (version 1.22.384).
But, because you're using Windows ME, the same family with Windows 98, there is no Secure Deletion option. Secure Deletion option only available for Windows 2000 and newer version.
From this link:
http://www.recuva.com/download
in System requirements section, we could know that Recuva could run on the following Windows version:
- Runs on Microsoft Windows Vista, XP, 2003, 2000 and 98.
But, from this link:
http://www.recuva.com/download/version-history
in the middle of page, you could read this information:
----------------------
v1.10.223
- Added Secure Deletion option (Win2k and newer).
----------------------
So, Secure Deletion option only available for Windows 2000 and newer version. I want to test it, to install Windows ME on my Virtual Machine, and try to install Recuva on it. But, unfortunately, I don't have any Windows ME with me.
Hopefully it could answer your questions.