Just double checked the email confirmation from when I bought it in 2016. Most recent xpadder version is 2024.05.01.
Also if you’re looking for controller remapping software (and you’re on windows OS), check out DS4Windows. Contrary to the name, it works for most brands of controller, and it’s got a lot of stuff that xpadder doesn’t.
I landed on it for the better control stick adjusting (you can change dead zone/max zone, and also sensitivity curve). I stuck with it because it can use an emulated controller while hiding the actual controller from programs and games (which solves any double input jank from shit like steam).
Also it can also map gyro controls to mouse input, which is real neat for essentially using my joycons as a remote for my pc, and the occasion where splatoon style gyro aiming fits in games without being too barfy.
Last update a month and a half ago. Great for what it is, but ds4windows is my go to until it stops working for me. More complicated, but it offers a good deal more finetuning.