R help - Mar 2022 - Problem downloading pcalg library/package

Dear R-experts,

Here below my sessionInfo( ). I cannot download the pcalg package/library. Is my
R version too old ?


sessionInfo()
R version 4.1.2 (2021-11-01)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Matrix products: default
BLAS:??
/Library/Frameworks/R.framework/Versions/4.1/Resources/lib/libRblas.0.dylib
LAPACK:
/Library/Frameworks/R.framework/Versions/4.1/Resources/lib/libRlapack.dylib

Random number generation:
?RNG:???? Mersenne-Twister
?Normal:? Inversion
?Sample:? Rounding
?
locale:
[1] fr_CH.UTF-8/fr_CH.UTF-8/fr_CH.UTF-8/C/fr_CH.UTF-8/fr_CH.UTF-8

attached base packages:
[1] stats???? graphics? grDevices utils???? datasets? methods?? base??? ?

loaded via a namespace (and not attached):
[1] compiler_4.1.2 tools_4.1.2?


install.packages("pcalg")
Installation du package dans ?/Users/Caro/Library/R/4.1/library?
(car ?lib? n'est pas sp?cifi?)
Avis : unable to access index for repository http://cran.cict.fr/src/contrib:
? impossible d'ouvrir l'URL
'http://cran.cict.fr/src/contrib/PACKAGES'
Avis : unable to access index for repository
http://cran.cict.fr/bin/macosx/contrib/4.1:
? impossible d'ouvrir l'URL
'http://cran.cict.fr/bin/macosx/contrib/4.1/PACKAGES'
Message d'avis :
le package ?pcalg? n'est pas disponible for this version of R

Une version de ce package pour votre version de R est peut-?tre disponible
ailleurs,
Voyez des id?es ?
https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages

On Thu, 24 Mar 2022 12:54:46 +0000 (UTC)
varin sacha via R-help <r-help at r-project.org> wrote:
> Avis : unable to access index for repository
> http://cran.cict.fr/src/contrib: impossible d'ouvrir l'URL
> 'http://cran.cict.fr/src/contrib/PACKAGES' Avis : unable to access
> index for repository http://cran.cict.fr/bin/macosx/contrib/4.1:
> impossible d'ouvrir l'URL
> 'http://cran.cict.fr/bin/macosx/contrib/4.1/PACKAGES'
I can't open these links either. It looks like the CRAN mirror you're
using is down. Use chooseCRANmirror() to set a different one.
See ?Rprofile for some information on where this choice might be stored
on your system.

-- 
Best regards,
Ivan