It is possible to return to QGIS 2.4 OSGeo4W installation when I have QGIS 2.6?
I want to do this with advanced installer.
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You can revert to QGIS 2.4 only if you have the QGIS 2.4 installation files still on disk. You can click on the version number in advanced install to toggle between the available versions. On the server you will find only 220.127.116.11 and 18.104.22.168.
A better way is to use the standalone installer, which can be found at this site:
for all past versions.
The main obstacle is that you can not switch the plugins between older versions. You van find older plugin versions at http://plugins.qgis.org/plugins/, but they will be stored on your computer in the same place.
Especially the current Openlayers plugin will not work with older QGIS versions.