Gee, beari, I'm sorry things aren't working yet.
Yes, it's just a question of replacing the existing .exe with the fix one but they must be the same version and for you, the 3440 x 1440 version. Keep in mind that any subsequent patch that changes your version of Witcher 3 means you have to replace the .exe with a revised version of the fix.
If you were running 1.30 and used the 1.30 fix, then tried to play, if Steam then updated you to version 1.31 that would mean the 1.30 patch isn't going to work because you now need the 1.31 patch.
Have you tried running as is online, then checking what version of Witcher3 you have, then selecting the appropriate fix.
Maybe someone else can pin down where it's going wrong for you. At least you can keep trying.
ETA- Probably nothing to do with it but I presume your Acer Predator is set for 3440 x 1440 through a display port, and the Nvidia Control panel (if you are on Nvidia) is showing the required refresh rate. I had to reduce mine to 95hz because I crashed on 100hz.
Just mentioning out of interest - Rise of the Tomb Raider needs no tweaking for 3440 x 1440 on 21:9 although pre-rendered cut scenes are in 16:9. I didn't mind it and didn't find it particularly distracting.
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