Thanks for your quick reply. I tried: remotes::install_version('glmnet', version = '2.0-18')
...and am getting the following error message about compilation failure and gfortran:
gfortran -fPIC -g -O2 -c glmnet5dpclean.f -o glmnet5dpclean.o
make: gfortran: No such file or directory
make: *** [glmnet5dpclean.o] Error 1
ERROR: compilation failed for package ‘glmnet’
removing ‘/Users/meghanbyrne/Library/R/3.5/library/glmnet’
Error: Failed to install 'unknown package' from URL:
(converted from warning) installation of package ‘/var/folders/b7/11vgsqxs32v11ss28278gl7h0000gp/T//Rtmp6U26K5/remotes8d95368fd916/glmnet’ had non-zero exit status