This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer package.

The command (syntax) below prompted this error and below the syntax are steps to mitigate or resolve this error.

msiexec /i PasswordServerSelfServe_x64.msi URLPROPERTY=https://xxxxxxxxxxxxx.com INSTALLFOLDER="C:\Programs\software"

Solution:
There is actually no direct answer to this error, having to troubleshoot, you could find answers why this error person

  1. Ensure you run command-line (cmd) with administrative privilege)
  2. Ensure you run the installer in the right user path in command-line (Ensure the path where you are running this application from is the same where the installer is saved)
  3. Ensure you have privileged access to the INSTALL FOLDER or else you will also have this error