'Scriptella : command not found

After installing scriptella, I get

command scriptella not found. 

So I added the <SCRIPTELLA_DIR>/bin to PATH by appending it in ~/.zshrc file to make it permanently and verify that scriptella is added to the path.

But I still get this error

$ echo $PATH 
/var/lib/scriptella/bin:/home/tah/.local/bin:/usr/local/bin:/usr/bin:/var/lib/snapd/snap/bin:/usr/local/sbin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl


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