You can run R and RStudio online without having to install or configure the programs to your computer. The free version of Posit Cloud (formerly RStudio Cloud) gives you basic computing resources with up to 25 computing hours per month with a max RAM of 1GB and 1 CPU.
To register, go to Posit Cloud on a browser. Sign up for Cloud Free and verify your email to access.
In 'Your Worksheet,' click ‘New Project,’ and then click ‘New RStudio Project.'