TTS Add-on for Firefox help

Ok found a TTS " verbify-TTS"

Says he has tested it on XFCE ,
So i have extracted the ZIP to Home directory, Renamed the file, opened file in terminal, then ran:

./INSTALL_LINUX.sh

This instructed me to install this for PIP management.

sudo apt install python3.8-venv

Again ran.

./INSTALL_LINUX.sh

Then got instructions to install the URL, this maybe my error ( wrong command?),

wget https://github.com/MattePalte/Verbify-TTS.git

Then tried again.

./INSTALL_LINUX.sh

Now this error:

As seen in next pic i have 'git' in the folder?

Im also curious about the German-transliterate ( im thinking for German voice?, or is this just to establish a connection to AL voice & can be configured later?)
Here the video link by the creator of Verbify-TTS.

Would greatly appreciate if they can see a wrong command or anything i've done wrong.
Or do you think it's because i'm using GNOME?