Install data.table successfully in R version 3.5.0.
Reference is here.
##Step 1： download .zip file##
Follow some steps in the image below, go to hereto download the “data.table_1.10.5.zip” to your R PATH (default is C:/Users/yourPCname/Documents/).
Tips：if the .zip file download from the（1）positon in the above image failed to install data.table, then try the other one in the（2）position in the above image.
##Step 2：Install data.table##
Launch R software (not Rstudio!), run the following R codes，
if output messages as: package ‘data.table’ successfully unpacked and MD5 sums checked, congratulations, you’r successfully install data.table.
run library(data.table) to confirm again.
if output messages as: package ‘data.table’ was built under R version 3.6.0 , OK, of course, it’s available under R version 3.5.0.
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