install MuMIn do not work

Hi community !
I am a very new R user... and I have some trouble with the installation of "MuMIn" package !
The error message is :slight_smile:Installation du package dans ‘C:/Users/Paul/Documents/R/win-library/3.6’
(car ‘lib’ n'est pas spécifié)
--- SVP sélectionner un miroir CRAN pour cette session ---
Warning: impossible d'accéder à l'index de l'entrepôt
impossible d'ouvrir l'URL ''
Warning message:
package ‘MuMIn’ is not available (for R version 3.6.1)

I do not understand, because I have a pretty recent R version ?
Can someone help me please?

Thx !

This error could be from an Internet connectivity issue with your R installation.
Do you have a proxy to configure ?

You will found several post on this community if you search for this kind of error.

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