You got right answers, but for the context, refer to below (section about hotfix install)
Andy
https://sc1.checkpoint.com/documents/R81.10/WebAdminGuides/EN/CP_R81.10_Maestro_AdminGuide/CP_R81.10...
Also, you go to clish and just run normal commands you would have otherwise to import package, verify, install. I would send you fantastic instructions about all this that PS guy from CP wrote for a customer, but sadly cannot, as its protected doc that was sent only for them.
CP-GW> installer
agent - Perform Deployment agent actions
check-for-updates - Check for new available packages in Check Point cloud
clean-install - Clean install a new major version
delete - Delete package
download - Download package
download-and-install - Download and install package
import - Import package
install - Install hotfix
reinstall - Reinstall package
uninstall - Uninstall package
upgrade - Upgrade to a new major version
verify - Verify if package is compatible with this machine
CP-GW> installer