Hello
As you say you already have the last version of Virtual Box and Wireshark installed. Wireshark needs WinPcap or Npcap for work so maybe you have one of them already installed. I suggest you to unistall wireshark and any other version of winpcap or npcap (check OS installed programs). Then try to install Winpcap v.4.1.3 first (download from the corresponding official site) and then install wireshark. After that, try to install eNSP.
Resume
1.VirtualBox 5.2.x
2.WinPcap 4.1.3
3.Wireshark
4.eNSP