I had to install an msi file on Vista today. An msi extension means the file is a Windows Installer file.
When I right-clicked and selected ‘install’ it failed. So I right-clicked again, thinking it had to be run as administrator, and there was no ‘run as administrator’ option.
Fortunately, there is a workaround.
1. Open up the command prompt in ‘run as administrator’ mode.
2. Navigate to the directory where the msi file is located.
3. msiexec /a “The Big App.msi”
The /a will install the file as an administrator.
