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Could be wrong but you should reinstall QGIS 3.18 with the new installer. QGIS standalone installers on Windows are all based on OSGEO4W. At the moment, 2 OSGEO4W installers and only the new one allows for point cloud support. See announcement at https://lists.osgeo.org/pipermail/qgis-user/2021-February/048137.html

You may try the new standalone installer based on MSI installer https://lists.osgeo.org/pipermail/qgis-user/2021-February/048199.html

Could be wrong but you should reinstall QGIS 3.18 with the new installer. QGIS standalone installers on Windows are all based on OSGEO4W. At the moment, 2 OSGEO4W installers and only the new one allows for point cloud support. See announcement at https://lists.osgeo.org/pipermail/qgis-user/2021-February/048137.html

You may try the new standalone installer based on MSI installer https://lists.osgeo.org/pipermail/qgis-user/2021-February/048199.html

You can also see a video about the new MSI installer by Hans van der Kwast in YouTube https://www.youtube.com/watch?v=wbCbLs_XEMA

Could be wrong but you should reinstall QGIS 3.18 with the new installer. At the moment, 2 OSGEO4W installers and only the new one allows for point cloud support. See announcement at https://lists.osgeo.org/pipermail/qgis-user/2021-February/048137.html

You may try the new standalone installer based on MSI installer https://lists.osgeo.org/pipermail/qgis-user/2021-February/048199.html

Could be wrong but you should reinstall QGIS 3.18 with the new installer. QGIS standalone installers on Windows are all based on OSGEO4W. At the moment, 2 OSGEO4W installers and only the new one allows for point cloud support. See announcement at https://lists.osgeo.org/pipermail/qgis-user/2021-February/048137.html

You may try the new standalone installer based on MSI installer https://lists.osgeo.org/pipermail/qgis-user/2021-February/048199.html

Could be wrong but you should reinstall QGIS with the new installer. At the moment, 2 OSGEO4W installers and only the new one allows for point cloud support. See announcement at https://lists.osgeo.org/pipermail/qgis-user/2021-February/048137.html You may try the new standalone installer based on MSI installer https://lists.osgeo.org/pipermail/qgis-user/2021-February/048199.html

Could be wrong but you should reinstall QGIS 3.18 with the new installer. At the moment, 2 OSGEO4W installers and only the new one allows for point cloud support. See announcement at https://lists.osgeo.org/pipermail/qgis-user/2021-February/048137.html 

You may try the new standalone installer based on MSI installer https://lists.osgeo.org/pipermail/qgis-user/2021-February/048199.html