How to find and install pre-version of Outlook?

One of my laptops was installed the pre-version of outlook without my awareness......But I like it so much.

Accordingly I want to install this outllok on my another laptop after changing to Insider preview version for MS 365 & Win 11.  But I still could not find how to install pre-version of outlook on this laptop...

You response to the solution shall be highly appreciated. 

Regards.