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I find the easiest way to install is to:-<br>
<ol>
<li>Backup python Plugins(C:\OSGeo4W64\apps\qgis\python\plugins
for Python Plugins)</li>
<li>Delete the OSGEO4W folder </li>
<li>If you have other versions of the software installed via
standalone installers, uninstall all the Programs (QGIS,GRASS,
SAGA etc)</li>
<li>Run a search for QGIS and delete any other folders (besides
your Backup...be careful)<br>
</li>
<li>If you don't have ccleaner or similar install it, click on
Registry (Left icon second from top), Scan for issues & then
Fix selected issues, repeat untill there are no issues.</li>
<li>Download most recent version of OSGEO4W installer (not
standalone QGIS installer see <a class="moz-txt-link-freetext" href="http://trac.osgeo.org/osgeo4w/">http://trac.osgeo.org/osgeo4w/</a> )</li>
<li>Do a standard Desktop instillation, It will install QGIS GRASS
SAGA and uDig, R should also be installed (Im open to
correction)</li>
<li>When you have finished over wright the plugins folder with the
backup.</li>
<li>Now you may have some issues initially, but redirecting is
easy enough, just direct everything to the corresponding OSGEO4W
folder.</li>
</ol>
<p>This is what I remember having to do with my last instillation, I
cant currently verify the above, as I don't have sufficient rights
on my Work PC at present.<br>
</p>
<p>Regards,<br>
</p>
<p>Richard.<br>
<br>
</p>
<br>
<br>
<div class="moz-cite-prefix">On 14/07/2015 12:18, Bernd Vogelgesang
wrote:<br>
</div>
<blockquote cite="mid:op.x1rgdizul2i25i@bernd-terra-pc" type="cite">
<style type="text/css">body { font-family:'DejaVu Sans Mono'; font-size:12px}</style>
<div>Hi,</div>
<div><br>
</div>
<div>maybe your paths are mixed up from all those different
updates and versions you installed.</div>
<div>From my experience, updating versions of QGIS rarely runs
smoothly, so I always make "tabula rasa".</div>
<div>Under Windows, I uninstall everything connected with QGIS
remove/rename the .qgis2 folder and delete all registry entries
of QGIS with regedit.</div>
<div><br>
</div>
<div>When reinstalling, I found the OSGEO4W-installer with
advanced install mode had the best results (but harder to
understand).</div>
<div><br>
</div>
<div>If you want to go this way, be sure to write down all the
plugins you would like to have, save own scripts or model etc.
to a safe place.</div>
<div><br>
</div>
<div>You might still have problems when your paths in the Windows
enviroment variables are twisted as well.</div>
<div><br>
</div>
<div>Just my 2cents. If other know better ways to solve those
problems, please comment.</div>
<div><br>
</div>
<div>Cheers</div>
<div>Bernd</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Am 14.07.2015, 12:26 Uhr, schrieb Velizar Strumberger
<a class="moz-txt-link-rfc2396E" href="mailto:velizar.strumberger@gmail.com"><velizar.strumberger@gmail.com></a>:<br>
</div>
<br>
<blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px
solid; padding-left: 1ex">
<div dir="ltr">
<p class="MsoNormal">Hello to all</p>
<p class="MsoNormal">I am a great admirer of QGIS but I have
a serious problem and I
hope that there is someone that can help me. I started
working with QGIS 2.2
(Valmiera) and it worked OK. I then
(tried to) switched to QGIS 2.4 but then GRASS, SAGA and R
stopped working. I have a laptop Windows 7 64 bit and a
desktop
Windows XP 32 bit. The phenomenons are the same. </p>
<p class="MsoNormal">Installing it as a standalone or with
OSGeo4W gave the same
results.</p>
<p class="MsoNormal">These are the problems:</p>
<p class="">GDAL: OK it woks</p>
<p class=""> For <b>GRASS 6 and 7</b>: Missing dependency.
This algorithm
cannot be run :-(</p>
<p class=""> This is for <b>SAGA and TauDEM</b> : Ooooops.
The following
output layers could not be open</p>
<p class="">Channel Network C: <i>and
a log path </i>...........................</p>
<p class="MsoNormal" style="text-align:justify">The above
file(s) cannot be
opened, which probably indicates that they were not
correctly produced by the executed algorithm. </p>
<p class=""><b>For R</b>: Missing dependency. This algorithm
cannot be run
:-(</p>
<p class=""><b> Orfeo Toolbox</b>:</p>
<p class="">OTB folder not configured. Please configure before
running OTB algorithms.</p>
<p class="">(This also didn't work in
QGIS 2.2 but I didn't bother with his).</p>
<p class=""> </p>
<p class="">In the Processing->Options->Providers the
paths for
</p>
<p class="">GRASS 6.4.3 was
C:/OSGeo4W64/apps/grass/grass-6.4.3/etc/grass-run.bat</p>
<p class="">and for MSYS</p>
<p class="">C:/OSGeo4W64/apps/msys/msys.bat</p>
<p class=""> </p>
<p class="">This is wrong because I installed a standalone
version and there is no OSGeo4W64 folder.</p>
<p class="">I corrected the paths for both and pressed OK. I
opened
the Providers once again and saw that the two path were
converted to the
"original" ones that I "changed"; there is no way I can
change the paths set up during the installation</p>
<p class=""> </p>
<p class="">There is also a path for GRASS 7, but this was not
installed.</p>
<p class="">I have the impression that parameters for the
Providers
is from the previous installation through OSGeo4W - the
previous installation.</p>
<p class=""> </p>
<p class="">I truly believe that I did not uninstall or
delete a file (I also think that the first
time I did not uninstall but just deleted QGIS) that
determines such behavior
because I also noticed the following:</p>
<p class="">When I install QGIS (any version) and install some
plugins (which I would never use - as a test) and open the
toolbox with several
providers and when I uninstall this version and install it
once again I find
that the same plugins are installed and the toolbox is
opened exactly the same
as I left it in the previous installation.</p>
<p class=""> </p>
<p class="">I am not a computer wiz but just a humble
geologist who
wants to use software for my work.</p>
<p class=""> </p>
<p class="">Help - or explanation how to correct this would be
most
welcome.</p>
<p class=""> </p>
<p class="">Regards</p>
<p class="">Dr. Strumberger</p>
<p class=""> </p>
<p class="MsoNormal" style="text-align:justify"> </p>
<p class="MsoNormal" style="text-align:center" align="center"> </p>
<p class="MsoNormal">
</p>
<p class="MsoNormal" style="text-align:center" align="center"> </p>
<p class="MsoNormal"><br>
</p>
</div>
</blockquote>
<br>
<br>
<br>
<div id="M2Signature">
<div>-- </div>
<div>Bernd Vogelgesang<br>
Siedlerstraße 2<br>
91083 Baiersdorf/Igelsdorf<br>
Tel: 09133-825374</div>
</div>
<br>
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