How to install QGIS 3 using OSGeo4W in Windows OS

The Semi-Automatic Classification Plugin (SCP) version 6 (codename Greenbelt) will be released very soon.
This new version is compatible with QGIS 3 only; therefore you need to install the QGIS development version until QGIS 3 is officially released.

This post is a brief guide about how to install QGIS 3 in Windows OS using the OSGeo4W installer.

To install QGIS 3, first download the OSGeo4W installer x86 from http://download.osgeo.org/osgeo4w/osgeo4w-setup-x86.exe or OSGeo4W installer x64 from http://download.osgeo.org/osgeo4w/osgeo4w-setup-x86_64.exe according to your operating system.

Then start the installer and select Advanced Install.

Check Install from Internet and click Next.

Select the installation directory and click Next.

Select the local package directory and click Next.

Select Direct connection (or select an internet connection option) and click Next.

Select the first download site and click Next.

In the package list select qgis-dev (in category Desktop) until QGIS3 is released.

 In the package list select python3-matplotlib (in category Libs).

In the package list select python3-numpy (in category Libs).

In the package list select python3-scipy (in category Libs) and click Next.

Click Next to install also other dependencies.

After the download, QGIS should be installed with all the required dependencies for SCP.

For any comment or question, join the Facebook group and the Google+ Community about the Semi-Automatic Classification Plugin.