I'm on the newest R version, and tried to backdown to another version but still get an error when trying to run various charts saying pkgInfo not found. When I try to install it, it says it is not available for this version of R.
pkgInfo is not an R package, it refers to something else, can you post the complete error message you get? Or even better a REPRoducible EXample (reprex) illustrating your issue?
package �assertthat� has no 'package.rds' in Meta/Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) :
object 'pkgInfo' not found