In some cases, the new version of R won’t find your existing R packages.
In other cases, R will find the existing packages, but they might not work correctly.
To avoid you installing again all your previous packages, go to your old library folder as per step 2 and copy your packages.
When you upgrade to a new version of R on your computer, it’s possible that everything will continue to work without any trouble, but it’s also possible that you’ll run into problems.
It is not easy to figure out how to update the core R package, but, like most things in linux, it comes down to a correctly ordered set of calls to a package manager.New minor versions are released about once per year.In general, there are no issues with subminor version upgrades, like going from 3.3.2 to 3.3.3, but there can be compatibility problems when there is a major or minor version upgrade.If you want to double-check that the package you have downloaded matches the package distributed by CRAN, you can compare the md5sum of the to the fingerprint on the master server.You will need a version of md5sum for windows: both graphical and command line versions are available. When you install a new version of R, it is installed in a new directory.