We have developed several examples which are ready for instant start with Graphical Installer (can be found in {Inno Setup 6}\Graphical Installer\Examples folder):

Basic example - This is basic example for Graphical Installer.
Basic example (graphics) - file with graphic settings for example.

Install Designer example - This example shows how to integrate dialog(s) created with Install Designer tool with Graphical Installer.
Install Designer example (graphics) - file with graphic settings for Install Designer example.

Code Classes example - This example shows how to use the WizardForm object and the various VCL classes.
Code Classes example (graphics) - file with graphic settings for example.

Skinned Button & Progress Bar Colors example - This example shows how to create custom installer page with components. Newly created page contains Skinned Button with click event and TNewProgressBar control with changed foreground and background colors.
Skinned Button & Progress Bar Colors example (graphics) - file with graphic settings for example.

VCL Styles for Inno Setup example - This example shows how Graphical Installer for Inno Setup and VCL Styles plug-in works together in single installer.
VCL Styles for Inno Setup example (graphics) - file with graphic settings for example.

Auto DPI example - This example demonstrates creating non rectangular forms (forms with transparent areas). It works well with all DPIs (Dots Per Inch settings): 96, 120, 144 and 192 and higher.
Auto DPI example (graphics) - file with graphic settings for example.

Multiple Backgrounds example - This example demonstrates using of Multiple OLE images (.jpg .gif .bmp) for background image.
Multiple Backgrounds example (graphics) - file with graphic settings for Multiple Backgrounds example.

Visual & Installer example - This example demonstrates integrating NSIS into Microsoft Visual Studio (any version).
Visual & Installer example (graphics) - file with graphic settings for Visual & Installer example.

RAD & Installer example - This example demonstrates integrating NSIS into Embarcadero RAD Studio (any version).
RAD & Installer example (graphics) - file with graphic settings for RAD & Installer example.

Irregular Form example - This example demonstrates creating non rectangular forms (forms with transparent areas).
Irregular Form example (graphics) - file with graphic settings for Irregular Form example.

In next section you can find several situations which can occur in your installer and solutions for them.

• How to switch between 'skinned' and 'classic' look of installer?

  To enable skinning mechanism of Graphical Installer you need to define symbol GRAPHICAL_INSTALLER_PROJECT. See the section File <project>.graphics.iss for details.
  
  When this symbols is defined skinning mechanism is enabled. Simply delete this symbol (or comment it out) and rebuild so the installer will look like any regular Inno Setup one.
  
  ; Semicolon character (;) at the beginning of line is a comment. Use it to comment the line out
  ; #define GRAPHICAL_INSTALLER_PROJECT "Some value"
  
  And of course if you define this symbol (remove comment) and rebuild the installer the skinning will work again.

• Inno Setup IDE (Compil32.exe) shows error Unknown Identifier 'SETTEXTSCOLORS' (the file/line/column number can vary)

  Compiler Error / File: C:\Program Files (x86)\Inno Setup 6\Graphical Installer\GraphicalInstaller_functions.iss
  Line 500: Column 14: Unknown identifier 'SETTEXTSCOLORS'
  
  
  
  The Graphical Installer and Inno Setup versions must match EXACTLY. That means you need to install for example Inno Setup 6.0.4 together with Graphical Installer for Inno Setup v6.0.4 (Vanka).
  If the versions do not match the script compiler complains that it cannot find function from SetTextsColors() which is defined inside Graphical Installer.
  
  Solution: Uninstall both products and install Inno Setup, then Graphical Installer with the exact version number.

• Back / Next / Cancel buttons are not correctly Enable/Disabled or Shown/Hidden. What to do?

  Your existing code looks typically like this:
  Wizardform.NextButton.Enabled := False; or Wizardform.CancelButton.Visible := True;
  
  Use the following function to enable/disable GI buttons:
  ButtonSetEnabled(hNextButton, False); // False to disable, True to enable the button
  
  Use the following function to show/hide GI buttons:
  ButtonSetVisibility(hCancelButton, False); // False to hide, True to show the button
  
  The correct variables of the Back / Next / Cancel buttons are: hBackButton / hNextButton / hCancelButton

• How to create background image for Inno Setup?

  See this technical section how to properly create background images for Inno Setup.

• TNewStaticText Runtime Error (path_to_some_file.iss) Line xxx:

  Exception: Control 'TNewStaticText($03931670)' has no parent window. Path:
  WizardForm
  .TWizardPage($0205B590)
  .TNewStaticText($03931670).

  
  
  Parent of TNewStaticText must be set before setting the Caption property: move the .Parent before .Caption (in this picture before line 224)