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<p>Hi Strumbi,</p>
<p>They can be installed and run in parallel. They have independent
settings.<br>
</p>
<p>The only restriction is: once you have saved a project in QGIS 3,
there may be no way back to 2.18.</p>
<p>The other thing to watch out is plugins or Python code: plugins
and Python code from QGIS 2.x don't run in QGIS 3.x. They have to
be revised because of the change from Python 2 to Python 3 and qt4
to qt5. In addition, the QGIS API changed considerably.
Theoretically, a plugin can be written to work in both QGIS 2 and
QGIS 3, but in practice, such plugins don't exist very often.<br>
</p>
<p>Greetings,</p>
<p>Andreas<br>
</p>
<br>
<div class="moz-cite-prefix">On 01.03.2018 10:22, Velizar
Strumberger wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEXECHQugd8Bg_oA7=_8wX54eUs-Zav_iKAxb+UL1AUsVLrVVw@mail.gmail.com">
<div dir="ltr">Hello
<div>I apologize if this question has been asked already. Should
I uninstall QGIS 2.18 before I install QGIS 3.</div>
<div>Thank you</div>
<div>Strumbi </div>
</div>
<br>
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