innosetup checking for 4.0 framework and installing if missing

Found a script online and tweaked it a bit. Figure others would like it to

[CustomMessages]
dotnetmissing=This application requires Microsoft Framework 4.0 which is not yet installed on this computer. Would you like to download it now?


function InitializeSetup(): Boolean;
var
ErrorCode: Integer;
netFrameWorkInstalled : Boolean;
isInstalled: Cardinal;
begin
result := true;

// Check for the .Net 4.0 framework
isInstalled := 0;
netFrameworkInstalled := RegQueryDWordValue(HKLM, 'SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\client', 'Install', isInstalled);
if ((netFrameworkInstalled) and (isInstalled <> 1)) then netFrameworkInstalled := false;




if netFrameworkInstalled = false then
begin
if (MsgBox(ExpandConstant('{cm:dotnetmissing}'),
mbConfirmation, MB_YESNO) = idYes) then
begin
ShellExec('open',
'http://www.microsoft.com/downloads/details.aspx?familyid=9CFB2D51-5FF4-4491-B0E5-B386F32C0992&displaylang=en',
'','',SW_SHOWNORMAL,ewNoWait,ErrorCode);
end;
result := false;
end;

end;

This code checks, downloads and installs it if needed. Make sure you have the isxdl.dll also deployed. If you don't know how it works Google: "isxdl.dll Innosetup".

[CustomMessages]
dotnetfx40_title=.NET Framework 4.0

en.dotnetfx40_size=48.1 MB

[Code]
const
dotnetfx40_url = 'http://download.microsoft.com/download/9/5/A/95A9616B-7A37-4AF6-BC36-D6EA96C8DAAE/dotNetFx40_Full_x86_x64.exe';

procedure dotnetfx40();
var
version: cardinal;
begin
RegQueryDWordValue(HKLM, 'Software\Microsoft\NET Framework Setup\NDP\v4\Full', 'Install', version);
if version <> 1 then
AddProduct('dotNetFx40_Full_x86_x64.exe',
'/q /norestart',
CustomMessage('dotnetfx40_title'),
CustomMessage('dotnetfx40_size'),
dotnetfx40_url);
end;