First of all Snap 6 is not the latest version, Ashampoo released Version 7 , and you may try your luck to get a full version license of Ashampoo Snap 7.
Ashampoo Snap 6 is a cool screen capture utility, which offers many options like Screen Capturing, record screen videos, free style screen capture, and many more features.
To capture the screenshot of your screen, you can use print screen button for that so you will not need any software for doing this. Softwares for screen capturing is needed when you want something additional, say take screen shot of a specific region, scrolling window, menu, screen record etc..
You can read a detailed review of Snap 6 here
You can get a free full version license of Ashampoo Snap 6 from here