It is incredibly easy to install. You simply open Logitech software, At the top you will see "Profiles". Right below that you will see a folder icon. Click that then click "Import". Find where you downloaded the .XML file then select that. Then simply assign it as default.
You might have to switch some of the commands around because not all logitech mice have the same button layout as mine.
In order to assign the "No recoil" macro to left mouse button, You have to have the left mouse click assigned to another button on your mouse or it wont let you do it.
Easy peasy. If you cant figure that out then ill make a video.