Is there a general problem with CRAN packages. install.packages() can't find them .
And Posit Package Manager says R4.5 is required?
Same with e. g. the Matrix Package
The pages you are looking at are a bit misleading. There are two copies of recommended packages such as lattice and Matrix on CRAN currently, and thus there are two copies on PPM as well. This is the copy for R-devel a.k.a. R 4.5. You only need this if you are running R-devel.
Recommended packages are included in most R distributions, so usually you don't need to install them separately.
If install.packages() fails for you, it is very unlikely that it has to do anything with the double copies of recommended packages. I suggest you include the full command you are running and also its full output here, so we can help you better.
Hi Gabor,
thanks for your answer and the insights. We use cloudsmith as a artefact store in our development. I suppose that there is a problem, that during lookup. Thank you for your help.