How to renew let's encrypt certificate?

can u pls help how to renew let's encrypt certificate?
usually my hosting do it , but now my client ask this ssl certificate to be install to their server. my host already give me the files of the certicate ( there's button to install it but i don't see how to renew it )

i want to renew it from my side before i sent to my client ... can u pls help ?

thanks

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