could not find function "ltdl.fix"

Im getting a "could not find function "ltdl.fix"" error. I have installed the update for R and R Studio (2022.07.01) and ltdl.fix doesnt work as the rgr package isn't available?

Looking for suggestions. Have tried robCompositions and that hasn't worked.

Thanks

The rgr package is no longer in CRAN, you can try to install it from the GitHub mirror

remotes::install_github("cran/rgr")