I found software available on an international olympus website. I was able to specify my operating system and my digital voice recorder model (VN-4100 PC) and voila, it gave me the download link for the full version software (not just an update).

I haven't actually installed it yet, so I don't know if it works but here is the link to the website: http://www.olympus-europa.com/consumer/2590_software.cfm?category=8&productgroup=347&product=&os=7&result=