just go to the link in my post above, look for "Download Location" you will find a link that downloads cleanup_tool.exe in a zip file.
I used the first link, and right clicked on dotnetfx_cleanup_tool.zip to pick download.
After you have downloaded that zip file to your computer somewhere, you need to extract the cleanup tool from the zip file you have downloaded, you need to keep track of where you placed it. Do the following,
Use the Windows Key + X, select command prompt (admin) from the list of commands, then key in
your folder you installed it\cleanup_tool.exe /q:a /c:"cleanup.exe /p .NET Framework 1.1"
once that is done, you will be able to install The Printshop 23.1 without a problem, someone else might be able to explain how to do this part better than I can.