MPC Desktop
Windows: Click the 3 lines in the top-left corner of the window, then go to Help > About MPC.
Mac OS: Click MPC from the Menu Bar in the top section of your screen, then go to Help > About MPC.
The window below will appear, displaying the software version in the bottom-left corner.
MPC Standalone
Go to Menu > Preferences > Info tab.
Your firmware version will appear in the center of the screen.