cannot install package in Rstudio

[tailchopper]

I am getting the following error RStudio for this
ERROR: dependencies 'bit64', 'rjson' are not available for package 'ravro'

• removing 'C:/Users/xyz/Documents/R/win-library/4.0/ravro'
  Warning in install.packages : installation of package ‘C:/xyz/ravro/ravro-master/build/ravro_1.0.4.tar.gz’ had non-zero exit status

Also when i run install_github("RevolutionAnalytics/ravro") it returns the error:
Error: Failed to install 'unknown package' from GitHub:
HTTP error 404.
Not Found

Did you spell the repo owner (RevolutionAnalytics) and repo name (ravro) correctly?

• If spelling is correct, check that you have the required permissions to access the repo.