Unfortunately, you can't purchase EXE to PPT because the official website is discontinued. I've searched and located what used to be the official link but a generic page is displayed instead. That page appears when the domain doesn't exist anymore or when the hosting discontinued the package.
However, since the software is not available anymore, but you still have the EXE file, the best thing is to record the screen to a movie and then import it in a PPT. You can choose some screen recorders from the following results list.