If you can be connected to the internet while using R and have administrator privileges, start R, and select Packages-->Install package(s).... From the dialog that pops up, you may be asked to select a "CRAN mirror"; select any location in or near your home country. You will then get a list of all available packages; select the item alr3, and then click OK. When you see "Delete downloaded files (y/N)?", type y, and then press the enter key. The package is now installed. You can get instructions to use the package.

If you cannot be connected to the internet while using R but you do have administrator privileges, download, but do NOT unzip, the file alr3_1.0.8.zip by clicking on the link with the right mouse button. Start R, and select the item Packages-->Install packages from local zip files, and then browse to the file you just downloaded.

If you don't have administrator privileges on your system, or if you are using a computer in a public lab, you will need to install the package in a location where you do have write privileges. We recommend that you create a directory called "Rlibraries", possibly in your "My Documents" directory or on removable media. Unzip the file alr3_1.0.8.zip into this directory.

You can get instructions to use the package.