Here's the report I made with the launcher, (once again):
It seems pretty empty too, and if I try to do it manually the funny thing is that... I don't have any "Arma 3" file in my C:\Users\<username>\AppData\Local\, only an "Arma 3 launcher" file...
Here's a screenshot:
I didn't tuch any file that has something to do with arma 3 after it's last installation, I don't know why it is missing.