How do you make Inno Setup not look frozen while performing a long Exec?

Question

The long Exec is installing .NET 3.5, and out script is based off this one: http://www.blackhillsoftware.com/blog/2006/06/26/using-innosetup-with-the-dotnet-fra

Answer 1

You can simply hide the installer wizard form by calling

WizardForm.Hide;
Exec(...);
WizardForm.Show;

though I agree that this is not really pretty.