Solving Issues such "No hms package" in R studio

For R studio and Windows Users

1.  Ensure that you install the latest R studio such as now Rstudio 3.5.3
2. Download   here  Rtools 3.5.exe
3.Install RTools at default recommended location (at the root of your C drive): C:/Rtools/
4. Ensure that you tick the two check boxes shown below.

5. Ensure that the default path is set as well as shown below

6. Confirm Rtool installation by running this command inside R

R> Sys.getenv('PATH')

Now you can run the packages that require compilation etc