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<p>I tried uninstalling and installing again using the stand alone installer. This gave the same error so I uninstalled it.</p>
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<p>Then I tried the OSGEO4W installer but it did not install exactly where I asked it to, instead it made its own directory on Y (<span>Y:\osgeo_download</span>). It did start up once but after that it failed to start and instead gave the same error about missing
.dll's even though they were present. I think I had a problem similar to this several qgis versions ago but it was then resolved, now the issue seems to be back.</p>
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<p>This is the <font size="2"><span style="font-size:10pt">\QGIS 2.18\bin\qgis.bat</span></font> file:</p>
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<div>@echo off<br>
call "%~dp0\o4w_env.bat"<br>
@echo off<br>
path %OSGEO4W_ROOT%\apps\qgis\bin;%PATH%<br>
set QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/qgis<br>
set GDAL_FILENAME_IS_UTF8=YES<br>
rem Set VSI cache to be used as buffer, see #6448<br>
set VSI_CACHE=TRUE<br>
set VSI_CACHE_SIZE=1000000<br>
set QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\qgis\qtplugins;%OSGEO4W_ROOT%\apps\qt4\plugins<br>
start "QGIS" /B "%OSGEO4W_ROOT%"\bin\qgis-bin.exe %*<br>
<br>
and this is the directory where the relevant .dll's are <span>Y:\osgeo_download\apps\qgis\bin</span><br>
but it says they are missing even though they are present in this directory.<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Qgis-user <qgis-user-bounces@lists.osgeo.org> on behalf of Andre Joost <andre+joost@nurfuerspam.de><br>
<b>Sent:</b> 26 February 2017 16:23:38<br>
<b>To:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] qgis 2.18.3 not installing on win 10</font>
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<div class="PlainText">Am 25.02.2017 um 21:58 schrieb Michael.Dodd:<br>
> Have been using qgis for years. Just uninstalled 2.14 and installed<br>
> 2.18.3 but it refused to start saying that qgis_app.dll,<br>
> qgis_core.dll and qgis_gui.dll are all missing.<br>
><br>
><br>
> Infact they are not missing, they are all present. However it seems<br>
> to be looking in the wrong place, think similar problem has occurred<br>
> with one or two previous versions. I am NOT installing on c: drive<br>
> as it has little space but instead installing on y: drive. This<br>
> worked fine for version 2.14 and various other programs but with<br>
> version 2.18.3 it does not work.<br>
><br>
><br>
<br>
You could try the OSGEO4W installer. It lets you choose the root <br>
directory where everything is installed to.<br>
<br>
Or have a look at \QGIS 2.18\bin\qgis.bat and o4w_env.bat. The variable <br>
OSGEO4W_ROOT might be set wrongly. You get it when you type set inside <br>
the OSGEO4W Shell. Override the definition if necessary.<br>
<br>
HTH<br>
André Joost<br>
<br>
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