On your main PAD window (with all your flows), go to Help -> About.
If you need it automated it would be something like:
Focus Power Automate Desktop (Preview) window
Send Keys {LShiftKey}({Tab:5}) (this is assuming the top flow is highlighted at start)
Send Keys {Enter} 'to select the Help Icon
Send Keys {Down} 'to move the selector down to the About
Send Keys {Enter} 'to select the About icon
OCR the active window
Parse Text on "Version " to %Position%
Get SubText from %Position + 8% to %Position + 20%
Good luck