diff --git a/build/env.bat b/build/env.bat
deleted file mode 100644
index f03f6e19..00000000
--- a/build/env.bat
+++ /dev/null
@@ -1,6 +0,0 @@
-CALL "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" 
-set PATH=C:\qt\qtbase\bin;%PATH%
-set PATH=C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin;%PATH%
-set INCLUDE=C:\Program Files\Microsoft SDKs\Windows\v7.1\Include;%INCLUDE%
-set LIB=C:\Program Files\Microsoft SDKs\Windows\v7.1\Lib;%LIB%
-set CL=/D_USING_V110_SDK71_
diff --git a/build/env64.bat b/build/env64.bat
deleted file mode 100644
index e43b1d38..00000000
--- a/build/env64.bat
+++ /dev/null
@@ -1,6 +0,0 @@
-CALL "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64 
-set PATH=C:\qt64\qtbase\bin;%PATH% 
-set PATH=C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin;%PATH%
-set INCLUDE=C:\Program Files\Microsoft SDKs\Windows\v7.1\Include;%INCLUDE%
-set LIB=C:\Program Files\Microsoft SDKs\Windows\v7.1\Lib\x64;%LIB%
-set CL=/D_USING_V110_SDK71_
diff --git a/pkg/gpxsee.nsi b/pkg/gpxsee.nsi
index 0bad81eb..f3934e61 100644
--- a/pkg/gpxsee.nsi
+++ b/pkg/gpxsee.nsi
@@ -1,5 +1,6 @@
 !include "MUI2.nsh"
 !include "x64.nsh"
+!include "WinVer.nsh"
 
 ; The name of the installer
 Name "GPXSee"
@@ -55,9 +56,15 @@ Var StartMenuFolder
 ; Languages
 !insertmacro MUI_LANGUAGE "English"
 
+Function .onInit
+  ${IfNot} ${AtLeastWin7}
+    MessageBox MB_OK "GPXSee can only be installed on Windows 7 or later."
+    Abort
+  ${EndIf}
+FunctionEnd 
 
 ; The stuff to install
-Section "GPXSee (required)" SEC_APP
+Section "GPXSee" SEC_APP
 
   SectionIn RO
   
@@ -122,16 +129,15 @@ Section "GPXSee (required)" SEC_APP
 
 SectionEnd
 
-Section "QT libs" SEC_QT
+Section "QT framework" SEC_QT
+
+  SectionIn RO
 
   File "Qt5Core.dll"
   File "Qt5Gui.dll"
   File "Qt5Widgets.dll"
   File "Qt5PrintSupport.dll"
   File "Qt5Network.dll"
-  File "libGLESv2.dll"
-  File "libEGL.dll"
-  File "D3DCompiler_47.dll"
   File /r "platforms"
   File /r "imageformats"
   File /r "printsupport"
@@ -140,6 +146,8 @@ SectionEnd
 
 Section "MSVC runtime" SEC_MSVC
 
+  SectionIn RO
+
   DetailPrint "Checking whether Visual C++ 2015 Redistributable is already installed..."
   ${If} ${RunningX64}
     ReadRegDword $R0 HKLM "SOFTWARE\Wow6432Node\Microsoft\VisualStudio\14.0\VC\Runtimes\x86" "Installed"
@@ -159,6 +167,21 @@ Section "MSVC runtime" SEC_MSVC
   done:
 SectionEnd
 
+Section "OpenSSL" SEC_OPENSSL
+
+  File "libeay32.dll"
+  File "ssleay32.dll"
+
+SectionEnd
+
+Section "ANGLE" SEC_ANGLE
+
+  File "libGLESv2.dll"
+  File "libEGL.dll"
+  File "D3DCompiler_47.dll"
+
+SectionEnd
+
 ;--------------------------------
 
 ; Uninstaller
@@ -201,15 +224,21 @@ SectionEnd
 
 ;Language strings
 LangString DESC_QT ${LANG_ENGLISH} \
-  "QT Library. Unselct only if you have QT already installed!"
+  "QT cross-platform application framework."
 LangString DESC_MSVC ${LANG_ENGLISH} \
-  "Visual C++ 2015 runtime components. Unselct only if you have the runtime already installed!"
+  "Visual C++ 2015 runtime components. If already installed, will be skipped."
+LangString DESC_OPENSSL ${LANG_ENGLISH} \
+  "OpenSSL library. Required for HTTPS to work."
+LangString DESC_ANGLE ${LANG_ENGLISH} \
+  "ANGLE (OpenGL via Direct3D). Enables OpenGL on systems without native OpenGL drivers."
 LangString DESC_APP ${LANG_ENGLISH} \
   "GPXSee application"
 
 ;Assign language strings to sections
 !insertmacro MUI_FUNCTION_DESCRIPTION_BEGIN
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_QT} $(DESC_QT)
+  !insertmacro MUI_DESCRIPTION_TEXT ${SEC_OPENSSL} $(DESC_OPENSSL)
+  !insertmacro MUI_DESCRIPTION_TEXT ${SEC_ANGLE} $(DESC_ANGLE)
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_MSVC} $(DESC_MSVC) 
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_APP} $(DESC_APP)
-!insertmacro MUI_FUNCTION_DESCRIPTION_END
+!insertmacro MUI_FUNCTION_DESCRIPTION_END
\ No newline at end of file
diff --git a/pkg/gpxsee64.nsi b/pkg/gpxsee64.nsi
index 694e37e5..c7c8c297 100644
--- a/pkg/gpxsee64.nsi
+++ b/pkg/gpxsee64.nsi
@@ -1,5 +1,6 @@
 !include "MUI2.nsh"
 !include "x64.nsh"
+!include "WinVer.nsh"
 
 ; The name of the installer
 Name "GPXSee"
@@ -55,7 +56,12 @@ Var StartMenuFolder
 ; Languages
 !insertmacro MUI_LANGUAGE "English"
 
-Function .onInit  
+Function .onInit
+  ${IfNot} ${AtLeastWin7}
+    MessageBox MB_OK "GPXSee can only be installed on Windows 7 or later."
+    Abort
+  ${EndIf}
+  
   ${If} ${RunningX64}
     SetRegView 64
   ${Else}  
@@ -65,7 +71,7 @@ Function .onInit
 FunctionEnd 
 
 ; The stuff to install
-Section "GPXSee (required)" SEC_APP
+Section "GPXSee" SEC_APP
 
   SectionIn RO
   
@@ -130,16 +136,15 @@ Section "GPXSee (required)" SEC_APP
 
 SectionEnd
 
-Section "QT libs" SEC_QT
+Section "QT framework" SEC_QT
+
+  SectionIn RO
 
   File "Qt5Core.dll"
   File "Qt5Gui.dll"
   File "Qt5Widgets.dll"
   File "Qt5PrintSupport.dll"
   File "Qt5Network.dll"
-  File "libGLESv2.dll"
-  File "libEGL.dll"
-  File "D3DCompiler_47.dll"
   File /r "platforms"
   File /r "imageformats"
   File /r "printsupport"
@@ -148,6 +153,8 @@ SectionEnd
 
 Section "MSVC runtime" SEC_MSVC
 
+  SectionIn RO
+
   DetailPrint "Checking whether Visual C++ 2015 Redistributable is already installed..."
   ReadRegDword $R0 HKLM "SOFTWARE\Wow6432Node\Microsoft\VisualStudio\14.0\VC\Runtimes\x64" "Installed"
   StrCmp $R0 "1" 0 +3
@@ -162,6 +169,21 @@ Section "MSVC runtime" SEC_MSVC
   done:
 SectionEnd
 
+Section "OpenSSL" SEC_OPENSSL
+
+  File "libeay32.dll"
+  File "ssleay32.dll"
+
+SectionEnd
+
+Section "ANGLE" SEC_ANGLE
+
+  File "libGLESv2.dll"
+  File "libEGL.dll"
+  File "D3DCompiler_47.dll"
+
+SectionEnd
+
 ;--------------------------------
 
 ; Uninstaller
@@ -205,15 +227,21 @@ SectionEnd
 
 ;Language strings
 LangString DESC_QT ${LANG_ENGLISH} \
-  "QT Library. Unselct only if you have QT already installed!"
+  "QT cross-platform application framework."
 LangString DESC_MSVC ${LANG_ENGLISH} \
-  "Visual C++ 2015 runtime components. Unselct only if you have the runtime already installed!"
+  "Visual C++ 2015 runtime components. If already installed, will be skipped."
+LangString DESC_OPENSSL ${LANG_ENGLISH} \
+  "OpenSSL library. Required for HTTPS to work."
+LangString DESC_ANGLE ${LANG_ENGLISH} \
+  "ANGLE (OpenGL via Direct3D). Enables OpenGL on systems without native OpenGL drivers."
 LangString DESC_APP ${LANG_ENGLISH} \
   "GPXSee application"
 
 ;Assign language strings to sections
 !insertmacro MUI_FUNCTION_DESCRIPTION_BEGIN
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_QT} $(DESC_QT)
+  !insertmacro MUI_DESCRIPTION_TEXT ${SEC_OPENSSL} $(DESC_OPENSSL)
+  !insertmacro MUI_DESCRIPTION_TEXT ${SEC_ANGLE} $(DESC_ANGLE)
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_MSVC} $(DESC_MSVC) 
   !insertmacro MUI_DESCRIPTION_TEXT ${SEC_APP} $(DESC_APP)
-!insertmacro MUI_FUNCTION_DESCRIPTION_END
+!insertmacro MUI_FUNCTION_DESCRIPTION_END
\ No newline at end of file