OSGeo4W is a binary distribution of a broad set of open source geospatial software for Windows environments. OSGeo4W includes QGISGDAL/OGRGRASS as well as many other packages. Check the official website for more information: http://trac.osgeo.org/osgeo4w/

Sometimes QGIS installation can be a troublemaker. For example you will install QGIS and you will notice that Style Manager will not show any symbols.

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The symbols database is not loaded. One option to solve this problem is installing QGIS through OSGeo4W (http://trac.osgeo.org/osgeo4w/). Anyway, the Window version can affect this also. If you want to install an older version of QGIS on a new Windows 10 platform you may notice that some features will not be available.

Go to http://trac.osgeo.org/osgeo4w/ and Download the 32bit or 64bit OSGeo4W network installer.

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Once the installer is fully downloaded click it and select Advanced Install.

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Next go and select Install from Internet.

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In the following step you will have to select the Installation directory and a local package directory where all the available applications will be installed.

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Select the Internet Connection. Click Next.

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Choose a download website. Click Next.

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The next window that will appear please expand it. It should look like in the image below.

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Expand the Desktop folder and in the list that will appear click on Skip.

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You will notice that you can install all the QGIS versions that are available. The new releases and the long term releases. Select to Install the QGIS Desktop 3.4 3-2 and QGIS 2.18.27-1. Click Next.

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Click Next.

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Click I agree with the above licence terms. Click Next.

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The installation will begin. Wait for a few minutes.

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Click Finish.

Go to Start > OSGeo4W and select a QGIS version.

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Recommended course:

QGIS Beginner Level