The OSGeo4W installer is recommended for regular users or organization deployments. It allows to have several QGIS versions in one place, and to keep each component up-to-date individually without having to download the whole package.

QGIS 3.36.2 and 3.34.5 in OSGeo4W and the standalone installers include many dependency updates compared to the previous versions (see posting ).
The updates affect Windows 7 support, which currently does not work. It is unclear yet whether it can be restored.

After installing QGIS, the first launch attempt may fail due to security protections. To enable QGIS, control-click on its icon in your Applications folder and select Open in the context menu. A confirmation dialog will display where you need to click the Open button again. This only has to be done once.