Listed below are the different methods for quickly finding the edition on Windows 8 machine.
Desktop (My Computer)
Step 1: Navigate to Desktop on Windows 8
Step 2: Right click on My Computer icon (This PC) and select Properties from the menu list.
Under Windows edition section, you should notice Windows 8.1 Pro (this varies as per your system)
Right click on the Windows menu and select System from the Context menu.
Step 1: Select Settings from the Charms bar
Step 2: Select PC info from the Settings menu list.