Copy the module folder to <Magento file system owner>/app/code/
To enable available modules, use the following comand:
php bin/magento module:enable Userengage_Engage
To disable available modules, use the following comand:
php bin/magento module:disable Userengage_Engage
If you enabled one or more modules, run the following command to update the database:
php bin/magento setup:upgreade