

You probably don’t need to read the rest of this document unless you want to learn much more about package libraries. If you are using a system like this, you can just reinstall your packages after upgrading R.
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This is an inconvenience, but the problem is obvious and it is easy to fix. On most single-user systems (Mac, Windows, and Linux), when you upgrade to a new minor version of R (like 3.3.0 to 3.4.0), R will not find the packages, you will need to reinstall your R packages.

The purpose of this document is to explain these problems, and how to fix them. In other cases, R will find the existing packages, but they might not work correctly. In some cases, the new version of R won’t find your existing R 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. Upgrading R: package compatibility issues
