It depends. What operating system does your laptop run? You need to go to the appropriate store and search for "FamiilyTree".
I've just been using the website: familysearch.org. I didn't even know there was a Windows app for it.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.