How to install package strengejacke

I am trying to install the strengejacke package, but I keep getting errors.

WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/lsj/Documents/R/win-library/3.6’
(as ‘lib’ is unspecified)
Warning in install.packages :
package ‘strengejacke’ is not available (for R version 3.6.3)

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