First of all, this should be posted on https://rage.mp/forums/forum/44-discussion/
Saying that, you need to copy the .dll it's asking for under runtime folder.
Add need lines like the one you have there:
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<acl_enabled>false</acl_enabled>
<log_console>true</log_console>
<log_chat>true</log_chat>
<resource src="WiredPlayers"/>
<resource src="admin"/>
</config>
There are both versions, choosing the right option (custom, default) on the creator.
The paid one has multiple bugs and crashes fixed, uses C# clientside and is the one i'm working into.
System.PlatformNotSupportedException: System.Management currently is only supported for Windows desktop applications.
That should be the cause, where did you get that from?