Innosetup - components

Using your code as an example:

2:
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[Types]
Name: "Server"; Description: "Installazione Server"
Name: "Client"; Description: "Installazione Client"

[Components]
Name: "program"; Description: "Program Files"; Types: Server; Flags: fixed
Name: "program"; Description: "Program Files"; Types: Client

[Run]
Filename: "{app}\Installation\mysql.exe"; Components: program;

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Sorry, I missed that you have the same component name twice.  You should probably change it to something like:

2:
3:
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[Types]
Name: "Server"; Description: "Installazione Server"
Name: "Client"; Description: "Installazione Client"

[Components]
Name: "program"; Description: "Program Files"; Types: Server; Flags: fixed
Name: "client"; Description: "Program Files"; Types: Client

[Run]
Filename: "{app}\Installation\mysql.exe"; Components: program;

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Let me explain better
the user running the setup has two possibilities ...
1. Client
2. server

If you choose 1. This installation package will install only Software.exe

if the user chooses 2. This installation package will install the Software.exe and mysql.exe

can you help me with a code example?

Following your advice I created this script, but eventually I get this error and not part of the installation mysql.exe

; Script generated by the Inno Setup Script Wizard.
; SEE THE  DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!

[Setup]
AppName=OpenGest PRO VERSIONE 4.9
AppVerName=OpenGest PRO
AppPublisher=OpenGest Software
AppPublisherURL=http://www.opengest.net
AppSupportURL=http://www.opengest.net
AppUpdatesURL=http://www.opengest.net
DefaultDirName=c:\programmi\OpenGest Software
DefaultGroupName=OpenGest Software
DisableProgramGroupPage=yes
LicenseFile=G:\PROGETTO OPENGEST\VERSIONI\Condizioni_vendita.txt
OutputBaseFilename=v49PRO
Compression=lzma
SolidCompression=yes
WindowVisible=yes
WizardImageFile=G:\PROGETTO OPENGEST\Setup\Immagini\WizModernImage-IS.bmp
WizardSmallImageFile=G:\PROGETTO OPENGEST\Setup\Immagini\WizModernSmallImage-IS.bmp

[Languages]
Name: italian; MessagesFile: compiler:Languages\Italian.isl

[Types]
Name: Server; Description: Server installation
Name: Client; Description: Client installation

[Components]
Name: Client; Description: Client Files; Types: Client
Name: Server; Description: Server File; Types: Server

;Name: "readme"; Description: "Readme File"; Types: full
Name: readme\en; Description: Italiano; Flags: exclusive
Name: readme\de; Description: Inglese; Flags: exclusive

[Tasks]
Name: desktopicon; Description: {cm:CreateDesktopIcon}; GroupDescription: {cm:AdditionalIcons}; Flags: unchecked
Name: quicklaunchicon; Description: {cm:CreateQuickLaunchIcon}; GroupDescription: {cm:AdditionalIcons}; Flags: unchecked

[Run]
Filename: {app}\Installation\mysql.exe

;Filename: "{app}\Installation\mysql.exe";
;Filename: "{app}\Upgrade\Opengest_SW_Updater.exe";
Filename: {app}\installation\mysql.exe; Components: Server
Filename: {app}\OpengestPRO.exe; Description: {cm:LaunchProgram,OpenGest}; Flags: nowait postinstall skipifsilent

;[Registry]
;Root: HKLM; Subkey: "SOFTWARE\Microsoft\Windows\CurrentVersion\Run"; ValueType: string; ValueName: "Opengest_SW_Updater"; ValueData: """{app}\Opengest_SW_Updater.exe"""; Flags: uninsdeletevalue
[Files]
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\OpenGestPRO.exe; DestDir: {app}; Components: Client Server
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Report\*; DestDir: C:\Programmi\OpenGest Software\Report; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Documenti\*; DestDir: C:\Programmi\OpenGest Software\Documenti; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Scontrini\*; DestDir: C:\Programmi\OpenGest Software\Scontrini; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Icone\*; DestDir: C:\Programmi\OpenGest Software\Icone; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Immagini\*; DestDir: C:\Programmi\OpenGest Software\Immagini; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\upgrade\*; DestDir: C:\Programmi\OpenGest Software\Upgrade; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Last; DestDir: C:\Programmi\OpenGest Software\Last; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Suoni; DestDir: C:\Programmi\OpenGest Software\Suoni; Flags: ignoreversion recursesubdirs createallsubdirs
Source: G:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\Installation\*; DestDir: C:\Programmi\OpenGest Software\Installation; Components: Server
Source: C:\Data\*; DestDir: C:\Data\; Flags: ignoreversion recursesubdirs createallsubdirs
;Source: "F:\PROGETTO OPENGEST\VERSIONI\4842\OpenGest Vittorio\gestionale\*"; DestDir: "C:\Programmi\MySQL\MySQL Server 5.0\data\gestionale"; Flags: ignoreversion recursesubdirs createallsubdirs
; NOTE: Don't use "Flags: ignoreversion" on any shared system files

[Icons]
Name: {group}\Opengest PRO; Filename: {app}\OpengestPRO.exe
Name: {group}\{cm:UninstallProgram,OpenGest PRO}; Filename: {uninstallexe}
Name: {commondesktop}\Opengest PRO; Filename: {app}\OpengestPRO.exe; Tasks: desktopicon
Name: {userappdata}\Microsoft\Internet Explorer\Quick Launch\OpenGest PRO; Filename: {app}\OpengestPRO.exe; Tasks: quicklaunchicon

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error.jpg

That seems to be a MySQL setup error message.  Can you run the mysql.exe program to install it outside of the InnoSetup program?