Failure to Install

[sydneyjoffre]

Hi, I'm trying to download this program, but I keep getting the following error message:

• installing source package 'aermod' ...
  ** using staged installation
  ** R
  Error in .install_package_code_files(".", instdir) :
  files in 'Collate' field missing from 'C:/Users/name/AppData/Local/Temp/Rtmp2JmuiC/R.INSTALL2e40307025e6/aermod/R':
  aermod.R
  read.obs.R
  ymdh.R
  ERROR: unable to collate and parse R files for package 'aermod'
• removing 'C:/Users/name/Documents/R/R-3.6.1/library/aermod'

I'm super new to R, so I have no idea what this means. Any help is appreciated!