Where to find qgsaffine in the menu?

In Qgis, Select Plugins > Manage Plugins and Select the qgsaffine plugin.

In Menu, it is located at Plugins > Geoprocessing > Affine

in normal installing qgis plugins locate under Plugins menu. i think you have to re-install it again because of wrong installaion or bugs...

you can also look at your plugin folder under Quantum GIS ... > apps > qgis > plugins or Quantum GIS ... > apps > qgis > python > plugins whether qgsaffine is there or not...

i hope it helps you...

I think they renamed it. Got to Plugins->Fetch Python Plugins... and select "Affine Transformations". You won't find it under qgsaffine anymore.

For Geoprocessing of DEM in QGIS 2.0 , there is an alternative to use qgSurf plugin. Hereby the description from the qgSurf developer:

This plugin allows to calculate the best-fit plane give a DEM and a set of points, or alternatively, given a geological plane, a DEM and a point, to calculate the intersections of the plane with the DEM.

I want to point out on the difference and similarity of those two plugin. qgsaffine plugin concerns on doing affine transformation, which is translation, rotation, scale on a vector. This function is basically covered in qgsurf plugin.

qqsaffine is developed in github and the qgsurf is bitbucket but both are python based developed plugin.

I wish that I can improve this answer more. Feel free to give some more constructive information to be added. Thanks

You can find it now under Vector (version 2.6.1):

In QGIS 3x you can find it in the toolbox:

Toolbox - Vector Geometry - Affine transformation.

Just start type Affine in the Toolbox search, you will get it on the list shortly.