opReports 4 is the NMIS 9 compatible version, requiring NMIS 9.1.0 (or newer) already installed on the same server that opReports is being installed on.
You will need a license for opReports 4 (evaluation licenses are available here).
All licenses are added/updated at https://<hostname>/omk/opLicense .
View the Release Notes here.
This version can be downloaded here.