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QGIS this year split into two branches:

Latest release (now 2.10.2)

Long term release (now 2.8.2)

I am not sure how is it normally in larger companies but I think having (hard)core GIS employees who need to work with OSGeo4W version and GIS users who are fine with standalone version is not that rare. And if these two groups need to work on the same projects they need same versions of QGIS.

That makes the GIS employees need to have either two versions (OSGeo4W 2.10 and standalone 2.8) or possibility to be able to downgrade with OSGeo4W to long term release version.

Is downgrade with OSGeo4W to long term release possible somehow? At this stage I have possibility to only downgrade to 2.10.1 in the advanced installed list.

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Using advanced install of the OSGEO4W installer, you can choose the package qgis-ltr. This will bring you the long term release qgis 2.8.x.

QGIS 2.10.1 and ltr can be installed together (same as QGIS and qgis-dev can). Double-clicking on a project file will open it with only one of them. You can change the version with doubleclicking on C:\OSGeo4W\apps\qgis\bin\qgis.reg or C:\OSGeo4W\apps\qgis-ltr\bin\qgis.reg.

BTW, I would suggest to use the standalone installer for larger companies, saving download time down to one single download. Standalone versions go always into different folders, hence can live happily together on your hard disk.

  • Use the advanced options as Andre says and on the Desktop tab you will see you can install multiple versions simultaneously - so you can have both 2.10.1 and 2.8.2 side by side. I used to do this a lot during the transition from 1.x to 2.x so I could get all the plugins I was used to. – MappaGnosis Jul 24 '15 at 9:26
  • Thank you, I completely missed that option below standard and developmental version. About month ago I was able to downgrade to 2.8 by changing 2.10 to 2.8 and that confused me. – Miro Jul 24 '15 at 10:19
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    That was before the official announcement of 2.10. It was still experimental, hence no ltr version was established, and downgrading from 2.10.0 to 2.8.2 was possible. – AndreJ Jul 24 '15 at 10:21

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