For Windows installers please go toThe main installers page.
Qgis Version
For new users we recommend the standalone installers.
Download Archive – QGIS. Note: due to the overlapping release schedule, LTR releases have an annoying habit of starting in the middle of a release. Version (. LTR) Date. For OS X 10.13 – macOS 10.15, 11 (High Sierra, Mojave, Catalina, Big Sur) QGIS 3.18.2-3. Download QGIS for Mac - Create very complex and detail-rich maps using a large variety of spatial data formats such as vector, raster and databases on a multiple operating systems.

These are alternate, semi-official QGIS packages. The installation is separated into a few installer packages, and components shared with other software or that are useful by themselves are installed outside the QGIS application. QGIS 3 uses Python 3.9, it does NOT use any other Python distribution.
For more advanced QGIS users you can use OSGeo4W packages, which make itpossible to install several versions in parallel.
The OSGeo4W repository contains a lot of software from OSGeo projects.QGIS and all dependencies are included, along with Python, GRASS, GDAL, etc.The installer is able to install from internet or just download all neededpackages beforehand.The downloaded files are kept in a local directory for future installations.Steps are:
- Download OSGeo4W Installer and start it 
- Select Advanced Install, 
- navigate to the Desktop section 
- and pick one or more of the following packages: - Release - Version - Package - Description - Latest Release - 3.20.x Odense - qgis - Release - qgis-rel-dev 14 - Nightly build of the upcoming point release - Long Term ReleaseRepository - 3.16.x HannoverLTR - qgis-ltr - Release - qgis-ltr-dev 24 - Nightly build of the upcoming point long term release - Development - 3.21 master - qgis-dev 34 - Nightly build of the development version 
Latest release nightlies SHA:
Latest long-term release nightlies SHA:
Master nightlies SHA:

Nightlies are debug builds (including debugging output)

Before installing any of the nightly builds note the warning.
Note
Quantum Gis For Mac
Don’t blindly do a full install of OSGeo4W. Only install QGIS andmaybe other components you like. Dependencies will be includedautomatically. A full install pulls in components that require third partyadditions, which need to be installed manually. These components render theinstallation unusable without those additions.