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Could you share the source of the newer versions? It's no longer in the archive.

right click the file -> properties -> select unblock if it's there

do the above on these files:
dinput8.dll
ScriptHookV.dll
ScriptHookVDotNet.asi
scripts\GTACoOp.dll
scripts\Lidgren.Network.dll
scripts\NativeUI.dll
scripts\Newtonsoft.Json.dll
scripts\protobuf-net.dll

@ImMatt You can change the display name through the settings submenu in the F9 menu, it will be used as long as the server allows it (it does by default).

@ZyDevs Through event arguments you now get a Client object instead, it contains the basic information you used RemoteUniqueIdentifier previously for, but if you ever need RemoteUniqueIdentifier again, you can get it by accessing the NetConnection property in the Client object.