R 4.5.0 was released today (April 11, 2025), and all R packages have to be rebuilt to work with this new version. Precompiled binaries for CRAN packages built for R 4.5 are now available on both the Posit Package Manager and the public site at https://p3m.dev.
Currently, only the latest versions of CRAN packages are available, but we'll rebuild historic versions over the next week or so. Let us know if you run into any issues with binaries for the new R version.