BUG #18615: installer cannot be executed as "nt-autorität\system"

The following bug has been logged on the website:

Bug reference:      18615
Logged by:          neeral85
Email address:      neral85@gmx.de
PostgreSQL version: 16.4
Operating system:   Windows x64
Description:

16.2 could be executed as "nt-autorität\system" while 16.4 cannot be
executed as "nt-autorität\system"

This is required by patch management software as it runs any installation as
"nt-autorität\system" and not with current login user.
----------
Log started 09/12/2024 at 12:23:00
Preferred installation mode : unattended
Trying to init installer in mode unattended
Mode unattended successfully initialized
Setting variable whoami from C:\Windows\System32\whoami 
Script exit code: 0

Script output:
 nt-autorität\system

Script stderr:
 

Error copying file from packed archive
C:/Users/User/tmp/postgresql-16.4-1-windows-x64.exe to
C:/Windows/Temp/postgresql_installer_a27c6b7106/prerun_checks.vbs
:Destination not writable
system's temp folder is not writable by the current user.
Exiting with code 1
------