Is the latest version of SurfSaver suitable for 64bit machines? And if not, is there any other program with similar functions, on the market?
No, there is no 64bit version of this application, because it has been discontinued. I've checked the official website and it appears to be expired. When accessed, a DNS error is displayed instead. However, there are plenty applications available that can be used as alternatives and the most used one is Evernote. I recommend you try it on the official website.