Exiftool not found despite it being installed

[MoutonDemocrate]

Hi, I'm using Arch Linux and installed the dependencies correctly. Launching exiftool from the terminal launches exiftool without a problem.
However, install.sh leaves me with this backtrace when I execute the script :

Error: This script needs root privileges. Restarting...
Checking installation files for integrity...
Checking installation directory...
Checking dependencies...
Error: Missing dependencies( exiftool)
Aborting installation.

I HAVE MODIFIED THE SCRIPT, but I just modified the InstallPath variable to use /usr instead of /usr/local, since my setup is global and therefore I am lacking a /usr/local/share/applications directory, which would prompt an error on execution.