Each TERR release has been compatibility tested using a specific version of the popular open-source third-party RStudio integrated development environment (IDE). The RStudio version used in testing is listed on the system requirements page for that TERR release. But for some TERR releases, the corresponding RStudio version is no longer available for download on the official RStudio website:
A search online for these older versions may not return the desired results. In such cases, the following URL can be used to download the archived versions: http://download1.rstudio.org/RStudio-{VERSION}.exe
Replace {VERSION} with the version number for the RStudio release that needs to be downloaded.