How to make Windwos installer for your mod automatically determines Steam folder tutorial - Half-Life

When you make a Half-Life mod you have to do the setup file for that would be comfortable future players to download and install it. Of course you can just pack it in the archives, but it is not convenient for the player. In this tutorial I'll show you how to quickly and easily do the installation file for your mod using Open Source software Inno Setup. So we begin.
1. Download Inno Setup (isetup-5.5.6.exe)
- install Inno Setup to your PC.
- run Inno Setup Compiler.
2. You'll see a dialog box.
-select the item: Create scritp file using the Script Wizard
-press button OK,
-press Next button.
3. Application Information
-required. Application name: type the name of your mod
-required. You'll see a dialog box version: type version of your mod
-not required. Application publisher: enter the name of developers team.
-not required. Application website: write the page address of your mod.
- press button Next.
4. Application Folder
-Application destination base folder: Program Files folder
-Application folder name: My Program
-Allow user to change the application foldier
-The application doesn't need a foldier
-Nothing changes, just click the button next
5. Application Files
Application main executable files: The folder in which the installation file is saved.
Tick the checkbox: The application doesn't have executable file
-press button: Add folder,
-select the path to the folder mode,
-press button OK,
-in the dialog box "Confirm" press button Yes.
-press button Next.
6. You'll see a dialog box: Application Icons
Application Star Menu foldier name: Enter the name of the mod
-The rest of the mark checkboxes as necessary,
-press button Next
7. Application Documentation:
-license file: enter the path to the file if necessary
-Information file shown before installation: enter the path to the file if necessary
-Information file shown after installation: enter the path to the file if necessary
-press button Next
8. Setup Launguages
-press button Next
9. Compiler Settings
-Custom comliper output folder: remain unchanged
-Compiler output base file name: type the name of the installation file.
-Custom Setting icon file: remain unchanged
-Setup password remain unchanged
-press button Next
10. Inno setup Preprocessor
-press button Next
11. Reporting successfully create an installation file.
-press button Next
12. Inno setup comiler
Would you like to compile the new script now?
- press button No.
13. We see the script - in fact a text file.
-go into the Setup section
-find the line: DefaultDirName={code:GetDefaultDir}
-replaced by DefaultDirName={code:GetDefaultDir}
-go into the Run section
-back down the line
-Insert the code

[code]
function GetDefaultDir(def: string): string;
var
sTemp : string;
begin
 sTemp := 'C:\Games\Half-Life';
 if RegQueryStringValue( HKEY_CURRENT_USER, 'Software\Valve\Steam', 'ModInstallPath', sTemp ) then
 begin
 end;
 Result := sTemp;
end;

-Save the script
-Press F9 button
-voilà installer ready.