Do I need Administrator rights?

Yes. Run the installer as Administrator to avoid permission issues and ensure dependencies install correctly.

Which should I install: LTR or Latest?

Choose LTR for stability and training environments; choose Latest to access new features. You can change this later via OSGeo4W.

Is this installer safe?

The link points to OSGeo's official server (download.osgeo.org). Always verify the source and keep antivirus enabled.

Official OSGeo link

Install QGIS on Windows: Step‑by‑Step Guide

Follow these quick steps to install QGIS on Windows using the official OSGeo4W Network Installer. Includes pre‑install checklist, version tips, and post‑install suggestions.

Download for Windows (OSGeo4W) Back to Download page

Unofficial site. We provide guidance and link directly to OSGeo's server (download.osgeo.org) for safe downloads.

Pre‑install checklist

Windows 10/11 (64‑bit) + internet access
2–4 GB free disk space (more for data)
Administrator rights to run the installer
Optional: add OSGeo4W path after install only if needed

Install QGIS via OSGeo4W

Download the installer
Use the official link to get osgeo4w-setup.exe.
Run as Administrator
Right‑click the file → Run as administrator. If SmartScreen appears, verify the source (download.osgeo.org) and proceed.
Choose “Install from Internet”
Keep the default root directory (e.g., C:\\OSGeo4W) unless you have a reason to change it.
Select architecture & mirror
Use 64‑bit on modern systems. Pick a nearby mirror for faster downloads.
Select QGIS (LTR or Latest)
Choose LTR for stability or Latest for new features. Optionally add GRASS, GDAL/PROJ extras if required.
Complete and launch
Finish the wizard. Open QGIS from the Start Menu. If something fails, see Troubleshooting.

Post‑install tips

Choose your branch

Need stability? Use LTR. Want the latest features? Try Latest. See LTR vs Latest.

Keep it updated

Re‑run OSGeo4W to update QGIS and dependencies. Avoid mixing different installers for the same machine.

Performance basics

Use 64‑bit, keep graphics drivers current, and store projects on SSD. More tips in System Requirements.

Quick fixes

Installer blocked? Temporarily allow it if your antivirus falsely flags it. Always keep AV on. See more fixes.

Old QGIS still present? Consider a clean uninstall before reinstalling via OSGeo4W.

FAQ

Do I need to uninstall old QGIS first?

It’s recommended to remove conflicting installs, especially if you previously used the MSI standalone, to avoid mixed dependencies.

Can I add GRASS or GDAL later?

Yes. Re‑run OSGeo4W and select additional packages. Keep to one installer family for consistency.

Where can I get help if QGIS won’t start?

Start with the Troubleshooting page for common errors and quick resolutions.