To see the changes made since the previous version check out
.NET Framework: R-Instat is a .NET software and requires an up to date version of the .NET (atleast 4.6.1) to be installed before it can run. Most new Windows version already have this. The Installation process will tell you if your .NET needs to be updated. if you need to download it, you can download .NET framework here.
Rtools: R-Instat requires Rtools to export data to Excel. if you do not intend to use this feature, you do not need to download Rtools. if you would like to you can download Rtool here.
R: R-Instat includes a built in copy of R, which performs all data processing in all data processing in R-Instat. You do not need to donwload R separately to use R-Intat. if you would like to know more about R see.https://cran.r-projects.org