Move the 7-Zip MSI installer to your Packageshare\Installers\7-Zip folder. The default package share is Program Files (x86)\Lansweeper\Packageshare on your Lansweeper server.
Go to Deployment tab in the web console, select the 7-Zip 18.05 - Installer
Click on 'Deploy Now'
You can deploy based on a selection of your choosing, however, we recommend using the report you imported earlier. You can also find the report in this forum topic.