R studio version

Can we use different R version for instance 3.5.1. and latest version on one P.C. simultaneously? and if so where or which path do we install it? I am Windows 10 user. Thank you .

I belive you are just making a typo, and you want to install Rcmdr instead of Rcmd

install.packages("Rcmdr")

Thank you, How can we relate this package in Arlequin files ?

Sorry, I'm not familiar with Arlequin files. Also, this is a different question, could you ask this on a new topic including a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

If you've never heard of a reprex before, you might want to start by reading this FAQ:

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