Package installation issues

Hi, I am new to R and RStudio. I had it working fine, but then I started getting errors, and I reinstalled the programs (R v. 4.0 and RStudio v. 1.2.5042 and Rtools40), and now I can't install packages.

Installing package into ‘C:/Users/jorlova/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)
Warning in install.packages :
unable to access index for repository
cannot open URL ''

There is a binary version available but the source version is later:
binary source needs_compilation
pkgbuild 1.0.6 1.0.7 FALSE

installing the source package ‘pkgbuild’

trying URL 'https:// cloud.r-project. org/src/contrib/pkgbuild_1.0.7.tar.gz'
Content type 'application/x-gzip' length 29159 bytes (28 KB)
downloaded 28 KB

  • installing source package 'pkgbuild' ...
    ** package 'pkgbuild' successfully unpacked and MD5 sums checked
    ** using staged installation
    ** R
    ** byte-compile and prepare package for lazy loading
    Error: .onLoad failed in loadNamespace() for 'processx', details:
    call: NULL
    error: package 'ps' was installed before R 4.0.0: please re-install it
    Execution halted
    ERROR: lazy loading failed for package 'pkgbuild'
  • removing 'C:/Users/jorl/Documents/R/win-library/4.0/pkgbuild'
    Warning in install.packages :
    installation of package ‘pkgbuild’ had non-zero exit status

The downloaded source packages are in

It tells me to install different packages one by one, like "ps" above, so I have been re-installing them, and it's taking forever. With every installation I get the same multiple warnings ( unable to access index for repository & cannot open URL)
The downloaded source packages are always in the Temp folder - this is weird, too, right?
I tried reinstalling R and RStudio. What else can I try? I'd appreciate your suggestions!

After a major R update, the only solution is to reinstall all your packages

No, this is normal behavior

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Do you happen to know if I can do anything about the warnings that I get with every package installation?

Warning in install.packages :
unable to access index for repository
cannot open URL ''

Change your default repository, I think this is happening because not all CRAN mirrors are up to date with the latest update.

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