Proxy support broken, cannot install any packages anymore

General
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This problem is caused by a change in R not RStudio. The R 4.2.0 changelog (link) says the following:

  • The (non-default and deprecated) method = "internal" for download.file() and url() no longer supports ‘⁠http://⁠’ nor ‘⁠ftp://⁠’ URIs. (It is used only for ‘⁠file://⁠’ URIs.)On Windows, download.file(method = "wininet") no longer supports ‘⁠ftp://⁠’ URIs. (It is no longer the default method, which is "libcurl" and does.)On Windows, the deprecated method = "wininet" now gives a warning for ‘⁠http://⁠’ and ‘⁠https://⁠’ URIs for both download.file() and url(). (It is no longer the default method.)

I've seen this on a corporate network and I can work around it by adding method = "wininet" when downloading packages eg install.packages("tidyverse", method = "wininet"). You'll get a warning but you should be able to use that until R4.3 comes out. Hopefully, we'll be able to get a fix before then.

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