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1. First, ensure that R is installed on your system. If not, you can download it from the official R Project website.

2. Install the required library 'httr' for R using the following command in R console: install.packages("httr")

3. Next, open a web browser and navigate to the download page for Aspentech Infoplus 21.

4. Once there, right-click on the "Download" button and select "Copy Link Address" or "Copy Link Location" depending on your web browser.

5. From here, open an R script editor and enter the following code, replacing "[link address]" with the link you just copied:

require(httr)

url <- "[link address]"
filename <- "infoplus21.zip"

if (!file.exists(filename)) {
  download.file(url, destfile = filename, method = "libcurl")
}

1. Run the code by highlighting it and pressing "Run" or "Ctrl + Enter".

2. Your download should start and save the file to the current working directory.

3. Once completed, extract the files from the downloaded ZIP archive and install Aspentech Infoplus 21 according to the instructions provided in its respective installation guide.

Note: Aspentech Infoplus 21 is proprietary software, so you may need to have a valid license to access and install it.