Execute postinstall program with administrator privileges in Inno Setup

Question

I'm trying to run another installer at the end of the installation (postinstall). The installer needs administrator provileges. So PrivilegesRequired=admin was added and the error still was there.

Error message below:

Unable to execute file:
C:\Users\User1\AppData\Local\Multi Webcam Video Recorder\webcam.exe

CreateProcess failed; code 740.
The requested operation requires elevation.

#define MyAppName "Multi Webcam Video Recorder"
#define MyAppExeName "webcam.exe"

[Setup]
AppName={#MyAppName}
PrivilegesRequired=admin

[Files]
Source: ..\src\webcam.exe; DestDir: {localappdata}\{#MyAppName}; \
    Flags: ignoreversion

[Run]
Filename: {localappdata}\{#MyAppName}\{#MyAppExeName}; \
    Description: {cm:LaunchProgram,{#MyAppName}}; \
    Flags: nowait postinstall skipifsilent

Answer 1

With postinstall flag, the program is by default executed with original privileges, even if the installer itself is running with Administrator privileges. To keep the (Administrator) privileges of the installer, add runascurrentuser flag:

[Run]
Filename: {localappdata}\{#MyAppName}\{#MyAppExeName}; \
    Description: {cm:LaunchProgram,{#MyAppName}}; \
    Flags: nowait postinstall skipifsilent runascurrentuser

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If the main installer does not have the Administrator privileges, see:
Execute postinstall program (sub installer) with administrator privileges in Inno Setup even if the main installer does not have them