title: how do you update R version if installr does not work?
body: <p>I was trying to update my R version (3.4.3, a little old) but when i was trying to install 'installr' packages and load it, I got errors</p>
  
  <pre><code>&gt; install.packages("installr")
  trying URL 
  'https://cran.rstudio.com/bin/windows/contrib/3.4/installr_0.20.0.zip'
  Content type 'application/zip' length 265893 bytes (259 KB)
  downloaded 259 KB
  
  package ‘installr’ successfully unpacked and MD5 sums checked
  
  The downloaded binary packages are in
      C:\Users\abc001\AppData\Local\Temp\RtmpKUhjgr\downloaded_packages
  
  &gt; require(installr)
   Loading required package: installr
  Loading required package: stringr
  Error: package or namespace load failed for ‘stringr’ in library.dynam(lib, 
  package, package.lib):
  DLL ‘stringi’ not found: maybe not installed for this architecture?
  Failed with error:  ‘package ‘stringr’ could not be loaded’
  In addition: Warning messages:
  1: package ‘installr’ was built under R version 3.4.4 
  2: package ‘stringr’ was built under R version 3.4.4 
  </code></pre>
  
  <p>After reading the errors, i guess my current problem is that 'installr' needs 'stringr' but they are built on 3.4.4. So now how do I update my R version if 'installr' depends on new R version (at least 3.4.4) but my current version is (3.4.3)?</p>
  
  <p>Thank you!</p>