Can't change my input.ini file

First of all, Hello!

This is the first time I post on here so I want to apologize beforehand if this is the wrong section to post this.

Anyways, a couple of weeks ago, I found a way to bind attack click move on the left mouse button, it got some time getting used to, but finally I was able to kite decently, since kiting with the more traditional settings didn't really feel natural for me.

Then, patch 5.18 came up, and after that I was unable to change the input.ini file again to work properly (I alternate between the regular input configuration, and the attack click move configuration depending on the type of champ I play, I usually play non-adc champs on the regular config)

So I was wondering if there is a way to make the file changeable again, or at the very least find out why I can't change it anymore.

Again, sorry if this isn't where I'm supposed to post this.