I list more recent engine version update times here:
Plugin Release Dates and UE4 Engine Versions
https://wiki.unrealengine.com/'s_Vertex_Snap_Editor_Plugin#Plugin_Release_Dates_and_UE4_Engine_Versions
For 4.8 try going back a ways
You should consider upgrading btw, lots of great stuff in 4.9
Okay I"ve written down
Not sure I understand how your question relates to displaying verticies, and yes you are welcome to use my plugin, just please credit me somewhere appropriate