Install a pre-compiled binary of R for your OS from here:
Already have R installed? Hold on: This is a great time to make sure your R installation is current. Check your current version like so:
R.version.string #>  "R version 4.1.1 (2021-08-10)"
Install RStudio Desktop.
Already have RStudio? Hold on: This is a great time to upgrade to the latest Preview version. Download it here:
Update your R packages:
update.packages(ask = FALSE, checkBuilt = TRUE)
Get current, people. You don’t want to adopt new things on day one. But at some point, running old versions of software adds unnecessary difficulty.
In live workshops, there is a limit to how much we can help with ancient versions of R or RStudio. Also, frankly, there is a limit to our motivation. By definition, these problems are going away and we’d rather focus on edge cases with current versions, which affect lots of people.
Is your R version “old”? R had a major version change in April 2020, with the release of 4.0.0. It is a good idea to be on the current major version, meaning 4.something at this point, especially if you want to get the most out of a workshop.
Each major version is followed by several years of smaller releases (minor and patch releases). You can be more relaxed about upgrading minor versions, but you still want to stay reasonably current. As the 4.something series unfolds, I advise that you never fall more than 1 minor version behind.
Concrete example: let’s say the released version of R is 4.7.1, which is totally fictional and well beyond the current version of R at the time of writing. It’s probably OK if you are still on 4.6.whatever, which is one minor version behind and is called “r-oldrel”. Being one minor version behind usually doesn’t cause trouble. Once you are 2 minor versions behind (4.5.whatever or earlier in this example), you will start to suffer. In particular, you can no longer install pre-built binary add-on packages from CRAN.
Is your RStudio “old”? Unless you have a specific reason to prefer the released version, try the Preview. RStudio is fairly conservative with official releases, so the Preview version is used by many people for their daily work. This allows you to enjoy the latest goodies much sooner. The Preview version updates much more frequently (and in smaller increments) than the released version. This is something you might update once every month or so.