While these are not intended to be called manually by users, they may be of some use for advanced users.
getPkgVersions(pkgDT, install = TRUE, verbose = getOption("Require.verbose"))A pkgDT data.table.
Logical or "force". If FALSE, this will not try to install
anything. If "force", then it will force installation of requested
packages, mimicking a call to e.g., install.packages. If TRUE, the
default, then this function will try to install any missing packages or
dependencies.
Numeric or logical indicating how verbose should the function
be. If -1 or -2, then as little verbosity as possible. If 0 or FALSE,
then minimal outputs; if 1 or TRUE, more outputs; 2 even more. NOTE: in
Require function, when verbose >= 2, the return object will have an
attribute: attr(.., "Require") which has lots of information about the
processes of the installs.
In general, these functions return a data.table with various package
information, installation status, version, available version etc.