I have recently installed the new version of QGIS and can't seem to find the vertices counter in the plugin menu to install. Does anyone know where I can find it?
Since QGIS is using QT 5 and Python 3, many plugins, if not all, need to be updated. You can refer to this article about the changes in PyQGIS API:
The existing plugins will not work properly in QGIS 3.0 due to the changes in the QGIS 3.x API compared with the QGIS 2.x API.