How to install Cpu manager in Zorin OS?

I'm a new Zorin user
I don't know to install & applications/ software in Linux & run them like we install run setup.exe but no idea for the Linux

I wanted to install CPU manager, however, I got this link:

https://extensions.gnome.org/extension/945/cpu-power-manager/

I'd appreciate it if anybody tells me the whole process to install Cpu manager in Zorin OS?

sudo apt install -y indicator-cpufreq

Different extension, same idea and easier to install. Combine with tlp for a great battery experience. I was getting barely 2.5 hours, am up to beyond 4 hours (also reduced my refresh rate and changed to integrated graphics on battery).

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Or follow CPUPower – Gnome Extension to Set CPU Frequency Scaling