The LISP-Help is installed with the ARES Commander version and it can be found in the Windows Start-menu program group under ARES Commander....

You can also navigate to the location using the address bar in a Windows Explorer window (C:\ProgramData\Microsoft\Windows\Start Menu\Programs\ARES Commander 2019 x64, in a standard/default path installation). 

For later/different versions than the one used in the example above, the path is maintained, with the path corresponding to the latest version installed, for example C:\ProgramData\Microsoft\Windows\Start Menu\Programs\ARES Commander 2024 x64.

The same file is available on "C:\Program Files\Graebert GmbH\ARES Commander 2024\LispReference.chm".