Inno Setup 6.2.1 web Download components problem - inno-setup-v6

Question

Having problems when Components section added to Inno Setup 6.2.1 download installation. Compiles ok, but unable to locate temporary file problem when code is run. What extra needs to be done when this download code is used for a components installer?
Simplified to a single custom install option.
Environment: Inno Setup 6.2.1, Windows 7
[Setup]
PrivilegesRequired=lowest
[Types]
Name: "custom"; Description: "Custom installation"; Flags: iscustom
[Components]
Name: "test"; Description: "Test File"; Types: custom; Flags: exclusive
[Files]
Source: "{tmp}\version.txt"; DestDir: "{userappdata}\wire"; DestName: "test.txt"; Components: "test"; Flags: external ignoreversion
[Code]
var
DownloadPage: TDownloadWizardPage;
function OnDownloadProgress(const Url, FileName: String; const Progress, ProgressMax: Int64): Boolean;
begin
if Progress = ProgressMax then
Log(Format('Successfully downloaded file to {tmp}: %s', [FileName]));
Result := True;
end;
procedure InitializeWizard;
begin
DownloadPage := CreateDownloadPage(SetupMessage(msgWizardPreparing), SetupMessage(msgPreparingDesc), #OnDownloadProgress);
end;
function NextButtonClick(CurPageID: Integer): Boolean;
begin
if CurPageID = wpReady then begin
DownloadPage.Clear
DownloadPage.Add('http://wireshare.sourceforge.net/WSSecurityUpdates/version', 'version.txt', '');
DownloadPage.Show;
try
try
DownloadPage.Download; // This downloads the files to {tmp}
Result := True;
except
if DownloadPage.AbortedByUser then
Log('Aborted by user.')
else
SuppressibleMsgBox(AddPeriod(GetExceptionMessage), mbCriticalError, MB_OK, IDOK);
Result := False;
end;
finally
DownloadPage.Hide;
end;
end else
Result := True;
end;