I've just had a hunt around: Here's an archived version (on waybackmachine) of the Needhams software download page. The original version of the page no longer exists.
http://web.archive.org/web/200711060...-download.html
The eighth item down, 'Ver 4.18' appears to be a self-extracting ARC file containing the EMP-10 software.
I have not downloaded it myself, please exercise due care and attention (scan for malware, etc) if you decide to download, extract and run this software which I think will be the DOS software.
Obviously, you already have the DOS software but this may be a later version with fewer bugs: Check the version number of the software you already have.