There aren't many versions released on the Internet except Netman Enterprise and Netman. The first version is for businesses and companies and the second one for home use. On the download page, use the Remote Mirror 2 to get the product.
However, I recommend using an easier solution called TeamViewer. It works even for firewalls or VPNs and it's constantly updated for latest versions of the available operating systems.
Here is the Netman website: http://www.netman123.com//download.asp
And the TeamViewer one: https://www.teamviewer.com/en/download/windows/