RMD packages can't be downloaded in R Studio - r

Question

I can't download the RMD packages in R studio. I tried it by running install.packages("rmarkdown"), and I tried it by File > New File > R Markdown > Download packages.
This is the output:
> install.packages("rmarkdown")
Installing package into ‘C:/Users/Luke/Documents/R/win-library/3.2’
(as ‘lib’ is unspecified)
also installing the dependencies ‘glue’, ‘stringi’, ‘knitr’, ‘yaml’, ‘stringr’
There are binary versions available but the source versions are later:
binary source needs_compilation
glue 1.0.0 1.3.1 TRUE
stringi 1.1.5 1.4.3 TRUE
knitr 1.15.1 1.23 FALSE
yaml 2.1.14 2.2.0 TRUE
stringr 1.2.0 1.4.0 FALSE
rmarkdown 1.4 1.13 FALSE
Binaries will be installed
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/glue_1.0.0.zip'
Content type 'application/zip' length 34947 bytes (34 KB)
downloaded 34 KB
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/stringi_1.1.5.zip'
Content type 'application/zip' length 14220135 bytes (13.6 MB)
downloaded 13.6 MB
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/yaml_2.1.14.zip'
Content type 'application/zip' length 180051 bytes (175 KB)
downloaded 175 KB
package ‘glue’ successfully unpacked and MD5 sums checked
package ‘stringi’ successfully unpacked and MD5 sums checked
package ‘yaml’ successfully unpacked and MD5 sums checked
The downloaded binary packages are in
C:\Users\Luke\AppData\Local\Temp\Rtmpq6rTgq\downloaded_packages
installing the source packages ‘knitr’, ‘stringr’, ‘rmarkdown’
trying URL 'https://cran.rstudio.com/src/contrib/knitr_1.23.tar.gz'
Content type 'application/x-gzip' length 880134 bytes (859 KB)
downloaded 859 KB
trying URL 'https://cran.rstudio.com/src/contrib/stringr_1.4.0.tar.gz'
Content type 'application/x-gzip' length 135777 bytes (132 KB)
downloaded 132 KB
trying URL 'https://cran.rstudio.com/src/contrib/rmarkdown_1.13.tar.gz'
Content type 'application/x-gzip' length 3155180 bytes (3.0 MB)
downloaded 3.0 MB
* installing *source* package 'stringr' ...
** package 'stringr' successfully unpacked and MD5 sums checked
** R
** data
*** moving datasets to lazyload DB
** inst
** preparing package for lazy loading
Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) :
namespace 'stringi' 1.1.5 is being loaded, but >= 1.1.7 is required
ERROR: lazy loading failed for package 'stringr'
* removing 'C:/Users/Luke/Documents/R/win-library/3.2/stringr'
Warning in install.packages :
running command '"C:/PROGRA~1/R/R-32~1.3/bin/i386/R" CMD INSTALL -l "C:\Users\Luke\Documents\R\win-library\3.2" C:\Users\Luke\AppData\Local\Temp\Rtmpq6rTgq/downloaded_packages/stringr_1.4.0.tar.gz' had status 1
Warning in install.packages :
installation of package ‘stringr’ had non-zero exit status
ERROR: dependency 'stringr' is not available for package 'knitr'
* removing 'C:/Users/Luke/Documents/R/win-library/3.2/knitr'
Warning in install.packages :
running command '"C:/PROGRA~1/R/R-32~1.3/bin/i386/R" CMD INSTALL -l "C:\Users\Luke\Documents\R\win-library\3.2" C:\Users\Luke\AppData\Local\Temp\Rtmpq6rTgq/downloaded_packages/knitr_1.23.tar.gz' had status 1
Warning in install.packages :
installation of package ‘knitr’ had non-zero exit status
ERROR: dependencies 'knitr', 'stringr' are not available for package 'rmarkdown'
* removing 'C:/Users/Luke/Documents/R/win-library/3.2/rmarkdown'
Warning in install.packages :
running command '"C:/PROGRA~1/R/R-32~1.3/bin/i386/R" CMD INSTALL -l "C:\Users\Luke\Documents\R\win-library\3.2" C:\Users\Luke\AppData\Local\Temp\Rtmpq6rTgq/downloaded_packages/rmarkdown_1.13.tar.gz' had status 1
Warning in install.packages :
installation of package ‘rmarkdown’ had non-zero exit status
The downloaded source packages are in
‘C:\Users\Luke\AppData\Local\Temp\Rtmpq6rTgq\downloaded_packages’
The C:\Users\Luke\AppData\Local\Temp\Rtmpq6rTgq\downloaded_packages folder contains:
Screenshot of named folder
I am very inexperienced with programming in R, so I have no idea what to do with this. I am learning to do it (via the online Udacity course), and for that I need these RMD packages to continue. I hope someone can help me.