Woops sorry that was a typo, I have tried all of the things you listed above and it still doesn't work with the vdH PoliceHelper addon.
ScriptHookDotNet logs...
2015-11-05 15:45:17 - Initializing ScriptHookDotNet v1.7.1.7 BETA (on GTA IV version 1.0.7.0 with C++ Hook version 0.5.1)
2015-11-05 15:46:04 - Direct3D device created!
2015-11-05 15:46:04 - SEARCHING FOR SCRIPTS...
2015-11-05 15:46:04 - Loading scripts in Assembly 'scripts\LCPDFR Loader.net.dll' ...
2015-11-05 15:46:04 - ...found script 'LCPDFR_Loader.Loader'!
2015-11-05 15:46:04 - ...found script 'LCPDFR_Loader.PublicScript'!
2015-11-05 15:46:04 - Loading scripts in Assembly 'scripts\vdH_PoliceHelper.net.dll' ...
2015-11-05 15:46:04 - ...found script 'vdH.PHelper'!
2015-11-05 15:46:04 - DONE! 3 valid scripts found!
2015-11-05 15:46:04 - STARTING SCRIPTS...
2015-11-05 15:46:04 - INFO: Phone number checks are not available!
2015-11-05 15:46:05 - ...successfully started script 'vdH.PHelper'!
2015-11-05 15:46:05 - ...successfully started script 'LCPDFR_Loader.PublicScript'!
2015-11-05 15:46:05 - ...successfully started script 'LCPDFR_Loader.Loader'!
2015-11-05 15:46:06 - Error during Tick in script 'LCPDFR_Loader.Loader':
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at LCPD_First_Response.Engine.Main.() in d:\GTA IV\LCPDFR\SVN\trunk\LCPD First Response\Engine\Main.cs:line 244
at LCPD_First_Response.Engine.Main.Main_Tick(Object sender, EventArgs e) in d:\GTA IV\LCPDFR\SVN\trunk\LCPD First Response\Engine\Main.cs:line 211
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at LCPDFR_Loader.Test.Tick(Object sender, EventArgs e)
at LCPDFR_Loader.Loader.Loader_Tick(Object sender, EventArgs e)
at GTA.Script.TryTick()
at GTA.Script.DoTick()
at GTA.ScriptThread.OnTick()
2015-11-05 15:46:22 - Direct3D device lost!
2015-11-05 15:46:22 - SCRIPTS TERMINATED!
AdvancedHook Logs...
Log started on: 15:46:5 11-5-2015
------------------------
[INFO - 15:46:5] Gameversion - 1.0.7.0
[INFO - 15:46:5] Data unprotected
[INFO - 15:46:5] Game patched
[INFO - 15:46:5] Xlive protections disabled
[INFO - 15:46:5] Improving ELS compatibility
[INFO - 15:46:5] AdvancedHook 0.38 (C) 2010-2015 LMS - Initialized
[INFO - 15:46:5] E-Mail: lms@lcpdfr.com
[INFO - 15:46:5] Permission granted for LCPDFR & ELS only
[INFO - 15:46:5] Thanks to listener, aru, #iv-modding and cp702
[INFO - 15:46:5] Attaching exception handler...
[INFO - 15:46:5] Exception handler attached
[INFO - 15:46:5] Patching game functions...
[INFO - 15:46:27] An exception occured
[INFO - 15:46:28] Minidump saved
[INFO - 15:46:28] Process: FFED0000
Address: 479346 (Faulting module: C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto IV\GTAIV\GTAIV.exe loaded into process space at 2D0000 - function offset without PE header is: 1A8346)
Code: C0000005
Registerdump - EAX: 1 EBP: F83A480 EBX: 0 ECX: 99CBA4D0 EDI: 187CB84 EDX: 600045F EIP: 479346 ESI: 4 ESP: 1CBE7B8
ScriptHook logs...
Log start: Thu Nov 05 15:45:17 2015
-----------------------------------------------
[INFO] GTA IV Script Hook 0.5.1 - (C) 2009, Aru - Initialized
[INFO] Process base address: 0x2d0000
[INFO] Auto detecting game version
[INFO] Using game version 1.0.7
[INFO] [ScriptHookDotNet] Thread started
[INFO] [AdvScriptThread] Thread started
[INFO] [AdvScriptThread] Thread killed
[INFO] [ScriptHookDotNet] Thread killed
[INFO] Script Hook - Shutdown
LCPDFR logs...
[INFO - 3:46:05 PM] [Log] Started
[INFO - 3:46:05 PM] [Main] Main: Initializing...
[INFO - 3:46:05 PM] [Main] Main: LCPDFR Engine (C) 2011-2013 LMS
[INFO - 3:46:05 PM] [Main] Main: DO NOT USE THIS WITHOUT PERMISSION. YOU MAY NOT SHARE, MODIFY OR DECOMPILE THIS FILE.
[ERROR - 3:46:06 PM] [] System.FieldAccessException: Attempt by method '..ctor()' to access field 'GTA.base.HandleObject.pHandle' failed.
at ..ctor() in d:\GTA IV\LCPDFR\SVN\trunk\LCPD First Response\Engine\Scripting\Entities\PoolUpdaterUnmanaged.cs:line 33
at LCPD_First_Response.Engine.Main.() in d:\GTA IV\LCPDFR\SVN\trunk\LCPD First Response\Engine\Main.cs:line 162
at LCPD_First_Response.Engine.Main.() in d:\GTA IV\LCPDFR\SVN\trunk\LCPD First Response\Engine\Main.cs:line 222