I can download version 3, but I can't seem to access it after I get it installed. I recently installed Windows 10 and it seems to be working fine.
Yes, the application is working just fine with Windows 10 operating system. Although it says it's compatible with 32bit versions of Windows and XP as the latest OS supported, I managed to install it in Windows 10 64bit without errors. After you download the installation package, right click the setup and choose Run as Administrator then follow the instructions.
Download page: http://www.mirekw.com/winfreeware/mwsnap.html