What version to choose and which is less vulnerable

[DamonA]

ep4 is best because you can fix the bugs & dupes with the source easy if you ahve knowledge with c++. 

ep4 have tools,server,client with source of all 

 

Ep1 is great & with the right files also nice vs dupes

Ep2 need too crashfree files & must disable some stuff because crash/dupe

Ep3 my opinion is the worse because the encryption is fail (easy to cheat/hack with packet editor etc.)