How to Download and Install QGIS 2.18.15 | QGIS Installation

QGIS is a free and open-source cross-platform application software of Geographic Information System (GIS) that supports view, editing, and analysis of geospatial data.
The full form of QGIS is "Quantum Geographic Information".

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Download Link:
Link for Windows OS:
http://qgis.org/downloads/QGIS-OSGeo4W-2.18.26-1-Setup-x86_64.exe
http://qgis.org/downloads/QGIS-OSGeo4W-2.18.26-1-Setup-x86.exe
http://qgis.org/downloads/QGIS-OSGeo4W-3.4.2-1-Setup-x86_64.exe
http://qgis.org/downloads/QGIS-OSGeo4W-3.4.2-1-Setup-x86.exe
Link for Mac OS X:
http://qgis.org/downloads/macOS/QGIS-OSX-2.18.26-1.dmg
http://qgis.org/downloads/macOS/QGIS-macOS-3.4.2-1.dmg
Link for Android Version:
https://play.google.com/store/apps/details?id=org.qgis.qgis
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