diff --git a/source/vcpp/buildEnv/INSTALLER README.txt b/source/vcpp/buildEnv/INSTALLER README.txt
index c23f5b70..ca600e68 100644
--- a/source/vcpp/buildEnv/INSTALLER README.txt	
+++ b/source/vcpp/buildEnv/INSTALLER README.txt	
@@ -1,6 +1,13 @@
-quick notes:
+License:
 
-* install command line cvs, include it in your system path variable
-* edit the cvs command in exportCVS.bat and set your own username
+The installer script if free to use for any other purpose. However you MUST NOT make
+your installer look like an official AssaultCube release, therefore DO NOT use the 
+official AssaultCube media to redistribute your own work.
+
+
+Quick installation notes:
+
+* install command line SVN, include it in your system path variable
+* edit the svn commands and set your own username
 * install NSIS
 * edit ac.nsi and fix the CURPATH variable
\ No newline at end of file
diff --git a/source/vcpp/buildEnv/ac.nsi b/source/vcpp/buildEnv/ac.nsi
index 37f73c59..1bf6f594 100644
--- a/source/vcpp/buildEnv/ac.nsi
+++ b/source/vcpp/buildEnv/ac.nsi
@@ -117,13 +117,15 @@ SetCompressor /SOLID lzma
 
 !define CURPATH "R:\projects\ActionCube\ac\source\vcpp\buildEnv" ; CHANGE ME
 !define AC_VERSION "v1.0"
+!define AC_FULLVERSION "v1.0.2"
+!define AC_FULLVERSIONINT "1.0.2"
 !define AC_SHORTNAME "AssaultCube"
 !define AC_FULLNAME "AssaultCube v1.0"
 !define AC_FULLNAMESAVE "AssaultCube_v1.0"
 
 Name "AssaultCube"
 VAR StartMenuFolder
-OutFile "AssaultCube_${AC_VERSION}.exe"
+OutFile "AssaultCube_${AC_FULLVERSION}.exe"
 InstallDir "$PROGRAMFILES\${AC_FULLNAMESAVE}"
 InstallDirRegKey HKLM "Software\${AC_FULLNAMESAVE}" ""
 RequestExecutionLevel admin  ; require admin in vista
@@ -504,7 +506,7 @@ FunctionEnd
 
 ; Installer Sections
 
-Section "AssaultCube v1.0" AC
+Section "AssaultCube ${AC_FULLVERSION}" AC
 
     SectionIn RO
 
@@ -513,6 +515,7 @@ Section "AssaultCube v1.0" AC
     File /r ac\*.*
 
     WriteRegStr HKLM "Software\${AC_FULLNAMESAVE}" "" $INSTDIR
+    WriteRegStr HKLM "Software\${AC_FULLNAMESAVE}" "version" ${AC_FULLVERSIONINT}
 
     ; Create uninstaller
     WriteRegStr HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\${AC_FULLNAMESAVE}" "DisplayName" "${AC_FULLNAME}"
diff --git a/source/vcpp/buildEnv/ac_patch.nsi b/source/vcpp/buildEnv/ac_patch.nsi
index f6135376..09836b71 100644
--- a/source/vcpp/buildEnv/ac_patch.nsi
+++ b/source/vcpp/buildEnv/ac_patch.nsi
@@ -80,10 +80,10 @@ FunctionEnd
 
 SetCompressor /SOLID lzma
 
-!define CURPATH "C:\temp\ac\ac\source\vcpp\buildEnv" ; CHANGE ME
+!define CURPATH "R:\projects\actioncube\_svn\trunk\ac\source\vcpp\buildEnv" ; CHANGE ME
 !define AC_VERSION "v1.0"
-!define AC_FULLVERSION "v1.0.1"
-!define AC_FULLVERSIONINT "1.0.1"
+!define AC_FULLVERSION "v1.0.2"
+!define AC_FULLVERSIONINT "1.0.2"
 !define AC_SHORTNAME "AssaultCube"
 !define AC_FULLNAME "AssaultCube v1.0"
 !define AC_FULLNAMESAVE "AssaultCube_v1.0"
@@ -349,6 +349,15 @@ Function WelcomePage
 	
 	# MessageBox MB_OK "This is a TEST BUILD, do NOT redistribute this file! This is NOT a final release!"
 
+	# validate existing installation
+	ClearErrors
+	ReadRegStr $0 HKLM "Software\${AC_FULLNAMESAVE}" ""
+	IfErrors 0 success
+	MessageBox MB_OK|MB_ICONSTOP "Could not find an existing installation of AssaultCube that could be updated with this Update package. Please get the full package at http://assault.cubers.net/download.html"
+	Quit
+	success:
+
+
 FunctionEnd
 
 Function FinishPage
@@ -397,7 +406,7 @@ Section "AssaultCube ${AC_FULLVERSION} Update" PATCH
 
     SetOutPath "$INSTDIR"
 
-    File /r ac\*.*      
+    File /r ac_patch\*.*      
 
 SectionEnd
 
diff --git a/source/vcpp/buildEnv/new-patch.ps1 b/source/vcpp/buildEnv/new-patch.ps1
index 9ab98382..aea381d1 100644
--- a/source/vcpp/buildEnv/new-patch.ps1
+++ b/source/vcpp/buildEnv/new-patch.ps1
@@ -1,23 +1,23 @@
 function new-patch
 {
-    param($from, $to);
+    param($from, $to)
     # get diff summary as XML
-    [xml] $summary = (svn diff $to $from -x --ignore-eol-style --xml --summarize);
+    [xml] $summary = (svn diff $to $from -x --ignore-eol-style --xml --summarize)
     # loop through all diff/paths/path nodes
     # each node represents a modified/new file
     foreach($item in $summary.diff.paths.path)
     {
         # the SVN url
-        $url=$_."#text";
+        $url=$item."#text"
         # the relative filename
-        $file=($_."#text".Substring($to.Length));
+        $file=($item."#text".Substring($to.Length))
         # the parent directory
-        $dir=($file | split-path -parent);
+        $dir=($file | split-path -parent)
         # create parent directory if it doesn't exist already
-        if((test-path $dir) -eq $false) { mkdir $dir -force};
+        if((test-path $dir) -eq $false) { mkdir $dir -force}
         # export current files from the SVN repository
         svn export $url $file
     }
     # package the current dir (.) into patch.zip
     sevenzip.exe a patch.zip .
-}
\ No newline at end of file
+}