Where to download the Elsevier journal latex template?

You can start with your first given link in your question. Then you will find search (red circle marked with 1):

Then search for latex template (see red circle marked with 2) and click on the sign in red cirle marked with 3.

After that you get a new content and the first result seems to be what you are searching for (red circle marked with 4) ...

Seems you can use the class on ctan, but please read the instructions ...