Ok, are not my business, but I read a bit of code and it’s the same of ManageWP Worker plugin by Prelovac, only changed copyrights.
Are you sure that GPLs license allow this?
Of course you can fork it, but until there is code written and copyrighted by another developer, need at least leave intact his copyright mentions…
Plugin installed in local and in remote, in both administration appear the alert: “Attention !
You activated the WPZeus worker plugin but have not yet added this site to your account. Please add the site to your control-panel now or deactivate the plugin.”
which account? where? what control panel? no menu installed to go somewhere.. what it means in point 3 of installation instructions: “Visit your given management URL and Login with your double-authentication” which or where “given management URL”?
And, apart plugin, is this a fee based service?