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<p>According to this page:<br>
<a class="moz-txt-link-freetext" href="https://help.pdq.com/hc/en-us/articles/360043283251-Uninstalling-software-based-on-the-program-name">https://help.pdq.com/hc/en-us/articles/360043283251-Uninstalling-software-based-on-the-program-name</a> <br>
PDQ Deploy is able to run an uninstall based upon the name of the
software.</p>
<p>In the example the match is made just by the registry key
containing the <i>displayname </i>of the program (starting with
"QGis"), <br>
one could easily extend that to match also on the publisher
("QGIS.org").</p>
<p>This way one can uninstall <i>all</i> previous (side-by-side)
versions. </p>
<p><br>
</p>
<p>regards, </p>
<p>Gert-Jan</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 8/14/2026 13:14, Johannes Kröger
(WhereGroup) via QGIS-User wrote:<br>
</div>
<blockquote type="cite"
cite="mid:9632ad92-f9b8-40db-8ad8-8f00d4990760@wheregroup.com">Hi
Ralf,
<br>
<br>
by default QGIS installers install into independent and
version-specific directories. You can adjust this, but if you
would install into a previous version's directory, it would be a
mess and also not unregister the old version in the OS registry,
menus etc.
<br>
<br>
The usual workflow is uninstalling the old version(s)
independently from the installation of a new version. If you
automate this as part of your deployment process or if you leave
the older versions on your users' systems, is really your choice.
For controlled end-user environments I would recommend adding the
removal of the older version as part of the upgrade to a new
version.
<br>
<br>
User data is kept separately from the application so this is
perfectly save. Newer QGIS versions might save things that are not
supported by older versions into the user data though, so using
multiple, different QGIS versions in parallel can lead to
(smaller) issues. (QGIS 3.x and 4.x do NOT share their user data
between the major versions 3 and 4, but all their subversions do
share between themselves).
<br>
<br>
Cheers, Hannes
<br>
<br>
On 8/14/26 12:05, Blöcher, Ralf via QGIS-User wrote:
<br>
<blockquote type="cite">If I have version 3.34 installed and
manually install version 3.44 over it, a second instance is also
created. So this has nothing to do with the software
distribution solution.
<br>
Is there a way to download the latest QGIS LTR version and then
install it over an existing version?
<br>
<br>
<br>
i.A. Ralf Blöcher
<br>
Informationstechnologie
<br>
E-Mail <a class="moz-txt-link-abbreviated" href="mailto:r.bloecher@traffiq.de">r.bloecher@traffiq.de</a>
<br>
traffiQ
<br>
Lokale Nahverkehrsgesellschaft Frankfurt am Main mbH
<br>
Stiftstr. 9 - 17
<br>
60313 Frankfurt am Main
<br>
<br>
Geschäftsführer: Prof. Dr.-Ing. Tom Reinhold
<br>
Aufsichtsratsvorsitzender: Stadtrat Wolfgang Siefert
<br>
Amtsgericht Frankfurt am Main - HRB 42452
<br>
USt-ID: DE187077253
<br>
<a class="moz-txt-link-abbreviated" href="http://www.traffiQ.de">www.traffiQ.de</a>
<br>
<br>
<br>
<br>
<br>
<br>
-----Ursprüngliche Nachricht-----
<br>
Von: QGIS-User <a class="moz-txt-link-rfc2396E" href="mailto:qgis-user-bounces@lists.osgeo.org"><qgis-user-bounces@lists.osgeo.org></a> Im
Auftrag von Greg Troxel via QGIS-User
<br>
Gesendet: Freitag, 14. August 2026 11:26
<br>
An: Blöcher, Ralf via QGIS-User
<a class="moz-txt-link-rfc2396E" href="mailto:qgis-user@lists.osgeo.org"><qgis-user@lists.osgeo.org></a>
<br>
Betreff: Re: [Qgis-user] Update QGIS-Desktop
<br>
<br>
"Blöcher, Ralf via QGIS-User" <a class="moz-txt-link-rfc2396E" href="mailto:qgis-user@lists.osgeo.org"><qgis-user@lists.osgeo.org></a>
writes:
<br>
<br>
<blockquote type="cite">I have a question about QGIS Desktop and
updating to a new version.
<br>
We install QGIS Desktop using a software distribution tool
called PDQ Deploy. We use this to install the
QGIS-OSGeo4W-3.34.11-1_LTR.msi file remotely on Windows
clients.
<br>
If I simply install the new Version
QGIS-OSGeo4W-3.44.12-1_LTR.msi file 'over' version 3.34, a
second instance of QGIS is installed on the computer.
<br>
<br>
But how can I remotely update version 3.34.11-1_LTR to version
QGIS-OSGeo4W-3.44.12-1_LTR.msi using a software deployment
tool without installing a second instance?
<br>
</blockquote>
This question is about "PDQ Deploy", which appears to be a
paid-for, proprietary tool. I suggest you address questions
about PDQ Deploy not doing what you want to your PDQ support
contacts.
<br>
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