Shigura got it right. The IPV4 was released with temp control, so you don't need to download it. The temp control only works with ni200 coils, and you need to switch the mod from Power (watts) mode to Joules mode. 5 clicks of the fire button with the mod on will access the menu. The first option is System, bypass this by hitting the fire button again. This will bring up the Mode option. By default it will show as Power. You need to hit either the Up or Down button to switch it to Joules. When switched to Joules, then further clicks of the fire button brings you to the options to set the temp to appear either as C or F, and to set the temp limit.