rNOMADS package

I am struggling to install a fix for the rNOMADS package which reads National Weather Service data.  I copied the fix (rNOMADS_2.5.0.tar.gz) from an email to a local drive and then tried to install it with the command below.  I also tried installing it without the .tar.gz extension and without the _2.5.0 extension but I get the same error message.  The author, Daniel Bowman, emailed me that the fix should work for R version 4.0 or better.

Do I need to untar it?

install.packages("C://Documents/Ballooning/WeatherBriefing/rNOMADS_2.5.0.tar.gz")

Installing package into ?C:/Users/Owner/Documents/R/win-library/4.0?
(as ?lib? is unspecified)
Warning in install.packages :
  package ?C://Documents/Ballooning/WeatherBriefing/rNOMADS_2.5.0.tar.gz? is not available (for R version 4.0.2)