Launching updater from base R

[howardm]

Hi,

You write:

"previously installed package retrieval feature is currently available only if launching udpater from base R rather than IDE like Rstudio. previously installed package retrieval feature is in beta mode and you may need to manually install back your packages after upgrading R version. "

For a beginner (me), can you provide more basic information about how to "...launching updater from base R [rather then RStudio which I use]"?

Then if necessary, how does one [best] manually install/upgrade packages ?

Thanks.