to play Apex Legends on PC with S1, here are some tips for that:
1. no need for DS4windows software, S1 can simulate XB360 controller or PS4 controller directly.
2. no need for a controller too, just leave USB1 of S1 open and plug your mouse and keyboard into USB2 and USB3,
then plug S1 into your PC.
3. you can start Apex Legends with Steam or Origin(EA), both are ok.
4. add a config for Apex Legends, and change the in-game settings as recommended in the popped-up window
5. change your mouse settings with its software or driver (5000dpi/500hz are recommended)
6. to harvest the best from S1, a ReaSnow S1+ReaSnow C1 bundle is a good choice.
with a C1, you can switch between the controller mode and the keyboard&mouse mode instantly in Apex Legends.