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If you read the whole thread, there is a working solution.
Just follow the information.

I also put a module for PS 8.0 here >
It is also necessary to read the text on the blue background.

https://www.prestashop.com/forums/topic/1080554-visitors-online-shows-module-not-found/?do=findComment&comment=3460318

https://www.prestashop.com/forums/topic/1080554-visitors-online-shows-module-not-found/?do=findComment&comment=3461325