@Ze-Doctor Unlikely they will answer you.
Going to suggest something that may or may not work but is worth a try.
From your video, it doesn't seem you have scripthook 5 installed? If that's the case, install it and dinput8.dll in the root folder.
dinput8.dll is the asi loader, the same one as the one packaged with OpenIV. Once installed, cross your fingers and see if the Asi Manager will open.
Worst case, we can upload OpenIV.asi and you can install it in your root folder.
Doesn't explain the read only issue...but again, worth a try.
Also, make sure GTA V isn't running while you install OpenIV. If the game is running files will be locked and that could be the issue. Once properly installed you can keep OpenIV open, but just to inspect files. That might be the problem as well? Game open?
N.B. while scripthook 5 isn't required for OpenIV, it will be required for modding. However nothing happens without dinput8.dll and I'm hoping that somehow it was an installation gone bad.