Help replacing path within INI

So I tried adding in that code, but it doesn't seem to do anything. The string never gets replaced. Below is my launcher, what am I doing wrong?

;Copyright 2004-2009 John T. Haller
;Copyright 2008-2009 Devo

;Website: http://PortableApps.com/VTPSUHMPortable

;This software is OSI Certified Open Source Software.
;OSI Certified is a certification mark of the Open Source Initiative.

;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;as published by the Free Software Foundation; either version 2
;of the License, or (at your option) any later version.

;This program is distributed in the hope that it will be useful,
;but WITHOUT ANY WARRANTY; without even the implied warranty of
;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;GNU General Public License for more details.

;You should have received a copy of the GNU General Public License
;along with this program; if not, write to the Free Software
;Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

!define PORTABLEAPPNAME "VTPSUHM Portable"
!define APPNAME "VTPSUHM"
!define NAME "VTPSUHMPortable"
!define VER "1.6.8.0"
!define WEBSITE "PortableApps.com/Development/test"
!define DEFAULTEXE "VTPSUHM7.exe"
!define DEFAULTAPPDIR "VTPSUHM"
!define DEFAULTSETTINGSDIR "settings"
!define LAUNCHERLANGUAGE "English"

;=== Program Details
Name "${PORTABLEAPPNAME}"
OutFile "..\..\${NAME}.exe"
Caption "${PORTABLEAPPNAME} | PortableApps.com"
VIProductVersion "${VER}"
VIAddVersionKey ProductName "${PORTABLEAPPNAME}"
VIAddVersionKey Comments "Allows ${APPNAME} to be run from a removable drive.  For additional details, visit ${WEBSITE}"
VIAddVersionKey CompanyName "PortableApps.com"
VIAddVersionKey LegalCopyright "PortableApps.com & Contributors"
VIAddVersionKey FileDescription "${PORTABLEAPPNAME}"
VIAddVersionKey FileVersion "${VER}"
VIAddVersionKey ProductVersion "${VER}"
VIAddVersionKey InternalName "${PORTABLEAPPNAME}"
VIAddVersionKey LegalTrademarks "PortableApps.com is a Trademark of Rare Ideas, LLC."
VIAddVersionKey OriginalFilename "${NAME}.exe"
;VIAddVersionKey PrivateBuild ""
;VIAddVersionKey SpecialBuild ""

;=== Runtime Switches
CRCCheck On
WindowIcon Off
SilentInstall Silent
AutoCloseWindow True
RequestExecutionLevel user
XPStyle On

; Best Compression
SetCompress Auto
SetCompressor /SOLID lzma
SetCompressorDictSize 32
SetDatablockOptimize On

;=== Include
;(Standard NSIS)
!include GetParameters.nsh
;!include Registry.nsh

;(Custom)
!include ReadINIStrWithDefault.nsh

;=== Program Icon
Icon "..\..\App\AppInfo\appicon.ico"

;=== Languages
LoadLanguageFile "${NSISDIR}\Contrib\Language files\${LAUNCHERLANGUAGE}.nlf"
!include PortableApps.comLauncherLANG_${LAUNCHERLANGUAGE}.nsh

Var PROGRAMDIRECTORY
Var SETTINGSDIRECTORY
Var ADDITIONALPARAMETERS
Var EXECSTRING
Var PROGRAMEXECUTABLE
Var INIPATH
Var DISABLESPLASHSCREEN
Var SECONDARYLAUNCH
Var MISSINGFILEORPATH
Var ISDEFAULTDIRECTORY
;Var FAILEDTORESTOREKEY

Section "Main"
	;=== Check if already running
	System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${NAME}") i .r1 ?e'
	Pop $0
	StrCmp $0 0 CheckINI
		StrCpy $SECONDARYLAUNCH "true"

	CheckINI:
		;=== Find the INI file, if there is one
		IfFileExists "$EXEDIR\${NAME}.ini" "" NoINI
			StrCpy $INIPATH "$EXEDIR"

		;=== Read the parameters from the INI file
		${ReadINIStrWithDefault} $0 "$INIPATH\${NAME}.ini" "${NAME}" "${APPNAME}Directory" "App\${DEFAULTAPPDIR}"
		StrCpy $PROGRAMDIRECTORY "$EXEDIR\$0"
		${ReadINIStrWithDefault} $0 "$INIPATH\${NAME}.ini" "${NAME}" "SettingsDirectory" "Data\${DEFAULTSETTINGSDIR}"
		StrCpy $SETTINGSDIRECTORY "$EXEDIR\$0"
		${ReadINIStrWithDefault} $PROGRAMEXECUTABLE "$INIPATH\${NAME}.ini" "${NAME}" "${APPNAME}Executable" "${DEFAULTEXE}"
		${ReadINIStrWithDefault} $ADDITIONALPARAMETERS "$INIPATH\${NAME}.ini" "${NAME}" "AdditionalParameters" ""
		${ReadINIStrWithDefault} $DISABLESPLASHSCREEN "$INIPATH\${NAME}.ini" "${NAME}" "DisableSplashScreen" "false"

		IfFileExists "$PROGRAMDIRECTORY\$PROGRAMEXECUTABLE" FoundProgramEXE NoProgramEXE

	NoINI:
		;=== No INI file, so we'll use the defaults
		StrCpy $PROGRAMEXECUTABLE "${DEFAULTEXE}"
		StrCpy $ADDITIONALPARAMETERS ""
		StrCpy $DISABLESPLASHSCREEN "false"

		IfFileExists "$EXEDIR\App\${DEFAULTAPPDIR}\${DEFAULTEXE}" "" NoProgramEXE
			StrCpy $PROGRAMDIRECTORY "$EXEDIR\App\${DEFAULTAPPDIR}"
			StrCpy $SETTINGSDIRECTORY "$EXEDIR\Data\${DEFAULTSETTINGSDIR}"
			StrCpy $ISDEFAULTDIRECTORY "true"
			Goto FoundProgramEXE

	NoProgramEXE:
		;=== Program executable not where expected
		StrCpy $MISSINGFILEORPATH $PROGRAMEXECUTABLE
		MessageBox MB_OK|MB_SETFOREGROUND|MB_ICONEXCLAMATION `$(LauncherFileNotFound)`
		Goto TheEnd

	FoundProgramEXE:
		StrCmp $SECONDARYLAUNCH "true" GetPassedParameters
		FindProc $1 "${DEFAULTEXE}"
		StrCmp $R0 "1" WarnAnotherInstance DisplaySplash

	WarnAnotherInstance:
		MessageBox MB_OK|MB_SETFOREGROUND|MB_USERICON `$(LauncherAlreadyRunning)`
		Goto TheEnd

	DisplaySplash:
		StrCmp $DISABLESPLASHSCREEN "true" CheckForSettings
			;=== Show the splash screen before processing the files
			InitPluginsDir
			File /oname=$PLUGINSDIR\splash.jpg "${NAME}.jpg"
			newadvsplash::show /NOUNLOAD 1200 0 0 -1 /L "$PLUGINSDIR\splash.jpg"
	
	CheckForSettings:
		IfFileExists "$SETTINGSDIRECTORY\*.*" GetPassedParameters
		;=== No settings found
		StrCmp $ISDEFAULTDIRECTORY "true" CopyDefaultSettings
		CreateDirectory $SETTINGSDIRECTORY
		Goto GetPassedParameters
	
	CopyDefaultSettings:
		CreateDirectory "$EXEDIR\Data"
		CreateDirectory "$EXEDIR\Data\settings"
		CopyFiles /SILENT $EXEDIR\App\DefaultData\settings\*.* $EXEDIR\Data\settings
		Goto GetPassedParameters

	GetPassedParameters:
		;=== Get any passed parameters
		Call GetParameters
		Pop $0
		StrCmp "'$0'" "''" "" LaunchProgramParameters

		;=== No parameters
		StrCpy $EXECSTRING `"$PROGRAMDIRECTORY\$PROGRAMEXECUTABLE"`
		Goto AdditionalParameters

	LaunchProgramParameters:
		StrCpy $EXECSTRING `"$PROGRAMDIRECTORY\$PROGRAMEXECUTABLE" $0`

	AdditionalParameters:
		StrCmp $ADDITIONALPARAMETERS "" UpdateDirectory

		;=== Additional Parameters
		StrCpy $EXECSTRING `$EXECSTRING $ADDITIONALPARAMETERS`
		
	UpdateDirectory:
		writeINIstr 'VTPSUHM.ini' '' 'AppDir' '"$EXEDIR\App\VTPSUHM\"'

	LaunchNow:
		CopyFiles /SILENT "$SETTINGSDIRECTORY\VTPSUHM.INI" "$PROGRAMDIRECTORY\VTPSUHM.INI"
		CopyFiles /SILENT "$SETTINGSDIRECTORY\VTPSUHM.GID" "$PROGRAMDIRECTORY\VTPSUHM.GID"
		Sleep 100
		ExecWait $EXECSTRING
		
	CheckRunning:
		Sleep 1000
		FindProcDLL::FindProc "${DEFAULTEXE}"                  
		StrCmp $R0 "1" CheckRunning
		
	;MoveSettingsBack:
		Sleep 100
		Delete "$SETTINGSDIRECTORY\VTPSUHM.INI"
		Rename "$PROGRAMDIRECTORY\VTPSUHM.INI" "$SETTINGSDIRECTORY\VTPSUHM.INI"
		Delete "$SETTINGSDIRECTORY\VTPSUHM.GID"
		Rename "$PROGRAMDIRECTORY\VTPSUHM.GID" "$SETTINGSDIRECTORY\VTPSUHM.GID"
		Goto TheEnd
		
	LaunchAndExit:
		Exec $EXECSTRING
	
	TheEnd:
		newadvsplash::stop /WAIT
SectionEnd