I can't find any information regarding ArcSoft Scan-n-Stitch Deluxe on its official website, so my best guess is that the application has been discontinued. From what I can see, the tool is compatible with Windows XP, but there's no official Mac version available. However, if you still have the application's installer, you can use a tool like Wine Bottler or Boot Camp to install it on your Mac as well.
Lastly, you could try contacting the developer directly using this link: http://www.arcsoft.com/contact/contactRetail.html and see if they can offer any assistance.