:xt_pkgs(note that the keyword starts with a colon) brings up a page listing the installed and available XicTools packages, for the current architecture. This requires internet access and http connectivity to wrcad.com.
One can select packages to download and optionally install by clicking on the check boxes. There are separate buttons to initiate downloading only, and downloading and installation. Package files, and the latest wr_install script if downloading, are downloaded to the current directory. Once installed, these files can be deleted.
The XicTools package management capability is available from the the internal help system in Xic and WRspice, and from the stand-alone mozy help browser.