How to install "fbi-master" R-package? Not visible in RStudio library

Question

I want to install these R pakage in R-Studios.

https://github.com/cykbennie/fbi

How can I install it?

I installed Rtools and set up the path.

Sys.which("make") "C:\rtools40\usr\bin\make.exe"

And afterwards I installed "fbi-master".

install.packages("C:/Users/user/Downloads/fbi-master.zip", repos = NULL, type = "win.binary") Installiere Paket nach ‘C:/Users/user/Documents/R/win-library/4.1’ (da ‘lib’ nicht spezifiziert)

After this, the pakage is in the right folder "win-library/4.1" how all my other packages. But unfortunately it is not visible in R-Studios library.

library(fbi-master) Error in library(fbi - master) : 'package' must be of length 1.

What I must do to install the package and and use its functions?

Thank you for any ideas an help.

Best regards.