I use 3.00. When minimized, the system tray shows the temps the way I've set up. The pinned .exe on the taskbar does not show any minimized window. When I cycle through Win/tab and Alt/tab, RealTemp is not part of the lineup.
I tried to "upgrade" to 3.70, but for some reasons, the system tray setup was confounding and the temperature readouts were 10 degrees C higher, even after a reboot from a long rest. Reverted back to 3.00. I hope there are no security holes. And I hope the temps are more legit than the 3.70.