Filemanager in gnome

Today I installed cinnamon (as third desktop) on my virtual machine. In cinnamon desktop nemo is really fast and makes no problems.

How can I add the nemo-image-converter to nemo? In guides always is said it can be installed with
sudo apt install nemo-image-converter
but the terminal shows "package can not be found".
I downloaded nemo-extensions from github which include this extension but I don't know how to install it. Do I need a special version for Zorin 17?

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