Installation and server related problems

I get an Error while activating the Plugin

Your PHP version does not support ZipArchive.

Unfortunately, we were unable to update your installed content types. You must manually download the update from H5P.org, and then upload it through the Upload Libraries section. If you need futher assistance, please file a support request or check out our forum.

Embedding h5p content doesn't work in browsers which have 3rd party cookies blocked (it's a native browser setting, not an addon, tested in Chrome and FF). The console displays error: "h5p-x-api-event.js?o721st:191 Uncaught SecurityError: Failed to read the 'localStorage' property from 'Window': Access is denied for this document." The script is trying to access localStorage, which results in error. Maybe wrap it in try/catch or use cookies?

Just installed H5P on WordPress. Install seemed to go fine, everything seems to work except the actual adding of new content.

When I try to add any new content, where the visual editor should be, I just get a line like:

[field:group:wizard:question]

or

[field:group:wizard:interactiveVideo]

The visual editor is missing; I guess that [field... line is supposed to be replaced by the editor code. I still see the accordion tabs for "Settings for "Show solution" button and "Retry" and "Settings and texts".