NSIS Installer: Detect if RequestExecutionLevel did not work

Question

I have

RequestExecutionLevel admin 

in my NSIS script.

The problem is, if Windows UAC is set to "never notify" and a normal user runs the installer, the installer attempts to proceed anyways without asking for permissions and fails with an obscure message half way through when it attempts to modify a directory user doesnt have permission to.

What I would like to do is fail fast and show a dialog right away saying "Please run as administrator".

I have tried adding the following snippit I found, but it ALWAYS fails unless the user is actually an admin (but not normal user with Admin execution level).

UserInfo::GetAccountType pop $0 ${If} $0 != "admin" MessageBox mb_iconstop "Administrator rights required!" SetErrorLevel 740 ;ERROR_ELEVATION_REQUIRED Quit ${EndIf}

Answer 1

There is no such thing as a normal user with administrator execution level. When a non-admin wants to elevate they must use the credentials of a administrator and the new process runs as this administrator, not the user. This is called Over The Shoulder elevation...

Using UserInfo::GetAccountType is the correct solution.