Packfor installing2

After an update of R to 4.0.3. and RStudio I cannot install the package packfor (https://rdrr.io/rforge/packfor/). Can someone help me? Thanks!

Message in the console:

install.packages("packfor")
WARNING: Rtools is required to build R packages but no version of Rtools compatible with the currently running version of R was found. Note that the following incompatible version(s) of Rtools were found:

  • Rtools 3.5 (installed at C:\Rtools)

Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/joachim.deru/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)
Warning in install.packages :
package ‘packfor’ is not available for this version of R

It looks like you need to update your version of Rtools.

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The message in the console was telling me that no compatible Rtools was available, therefore I did not try further.
But you were right, I just had to install Rtools and follow the instructions at https://cran.rstudio.com/bin/windows/Rtools/

Thank you