Not easy to find, had to use DuckDuckGo 😠 Hope this helps 🙂
https://www.nchsoftware.com/capture/versions.html
Well that was no good, there were no active links for downloads, just a list of versions. Sorry!
I suggest you write to Support - if you install the latest version there should be a link in the menus... otherwise, go to this page and scroll down to the bottom till you see this:
https://i.imgur.com/wHWMym7.jpg