Letsecrypt-win-simple upgrade

My current version of letsencrypt is version 1.9.11. ( Lets Encrypt Simple Windows Client)
The new one (1.9.7) Ive tested on a different server, which seems to have a lot of new features and functions

I would like to upgrade to the latest version. Do I overwrite the old one, or delete the old directory ?
Are there instructions for this update ?

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