Hi,
Our latest GA'd version is v4.2, for details about how to upgrade/migrate to v4.2 go to this IBM Knowledge Center link;
https://www.ibm.com/support/knowledgecenter/en/SSSHRK_4.2.0/itnm/ip/wip/install/task/nmip_upg_upgradingandmigrating.html
For details about how to upgrade/migrate to v4.1.1 go to this IBM Knowledge Center link;
https://www.ibm.com/support/knowledgecenter/en/SSSHRK_4.1.1/com.ibm.networkmanagerip.doc_4.1.1/itnm/ip/wip/install/task/nmip_upg_upgradingandmigrating.html
N.B. Within each link, use/enable the navigation tree (left pane) to navigate through the child related topics.