I have installed Mathematica v.9 previously, but I am tempted to use of Mathematica V.10, for this aim, before acting to Install newer version, do I have to uninstall V.9 completely. Or not (an option has embedded to V.10 for just upgrading and promotion of older version?) (I mean v.9 does not need to be uninstalled)? (I have heard, although I am not sure it is correct or not, just I heard, if I uninstall an older version in a machine I will face to many problems in order to use of any version of Mathematica again)

  • $\begingroup$ One of the related questions: mathematica.stackexchange.com/questions/28186/… $\endgroup$ – kirma Jul 19 '15 at 4:02
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    $\begingroup$ I have v9 and all versions since 10.0.0 installed on my Mac. They happily coexist. I can even run these different versions at the same time. I believe this is even documented to be a supported case; I just don't remember where. $\endgroup$ – kirma Jul 19 '15 at 4:04
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    $\begingroup$ Related: "Setting default Mathematica version." $\endgroup$ – Alexey Popkov Jul 19 '15 at 7:01

I am assuming that you are using a Windows machine. I have used Mathematica since version 7 and the upgrades are smooth. You do not have to be concerned about uninstall since the installation package will move the older files for you.

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  • $\begingroup$ Yes I am using of win 7 $\endgroup$ – Unbelievable Jul 19 '15 at 5:23

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